Change:
Version: 1.68.0-insider Commit: Date: 2022-06-02T05:17:01.962Z open the Settings JSON editor add some unnecessary commas no problems reported in the problems view. open the JSON Language Server log. Observe that there are no diagnostic requests. Other requests are sent and completed, so the language server is running.
Maybe unrelated: I was expecting "trailing comma" warnings in (we recently changed the schema to not accept them), but they only started showing after I flushed the schema cache (using the UI command) and reloaded the window (I can't completely rule out that a window reload alone would have helped).
I checked that with the fix the trailing commas are reported

Discussion:
] }, "dependencies": { <del> "vscode-languageclient": "^8.0.1", </del> <ins> "vscode-languageclient": "^8.0.2-next.4", </ins> "vscode-nls": "^5.0.0", "vscode-uri": "^3.0.3" },

"browser": "./dist/browser/cssServerMain", "dependencies": { "vscode-css-languageservice": "^6.0.1", <del> "vscode-languageserver": "^8.0.1", </del> <ins> "vscode-languageserver": "^8.0.2-next.4", </ins> "vscode-uri": "^3.0.3" }, "devDependencies": {

dependencies: lru-cache "^6.0.0" <del> vscode-jsonrpc@8.0.1: version "8.0.1" resolved "https://registry.yarnpkg.com/vscode-jsonrpc/-/vscode-jsonrpc-8.0.1.tgz#f30b0625ebafa0fb3bc53e934ca47b706445e57e" integrity sha512-N/WKvghIajmEvXpatSzvTvOIz61ZSmOSa4BRA4pTLi+1+jozquQKP/MkaylP9iB68k73Oua1feLQvH3xQuigiQ== </del> <ins> vscode-jsonrpc@8.0.2-next.1: version "8.0.2-next.1" resolved "https://registry.yarnpkg.com/vscode-jsonrpc/-/vscode-jsonrpc-8.0.2-next.1.tgz#6bdc39fd194782032e34047eeefce562941259c6" integrity sha512-sbbvGSWja7NVBLHPGawtgezc8DHYJaP4qfr/AaJiyDapWcSFtHyPtm18+LnYMLTmB7bhOUW/lf5PeeuLpP6bKA== </ins> <del> vscode-languageclient@^8.0.1: version "8.0.1" resolved "https://registry.yarnpkg.com/vscode-languageclient/-/vscode-languageclient-8.0.1.tgz#bf5535c4463a78daeaca0bcb4f5868aec86bb301" integrity sha512-9XoE+HJfaWvu7Y75H3VmLo5WLCtsbxEgEhrLPqwt7eyoR49lUIyyrjb98Yfa50JCMqF2cePJAEVI6oe2o1sIhw== </del> <ins> vscode-languageclient@^8.0.2-next.4: version "8.0.2-next.4" resolved "https://registry.yarnpkg.com/vscode-languageclient/-/vscode-languageclient-8.0.2-next.4.tgz#87dd364ffbd4356aff3af14e7b557d9fe34d2b67" integrity sha512-j9BEiCYMN9IoKwYdk9iickV6WNPVGPoVO11SMdoxFnWPIT3y5UAe3qf/WsfA9OdklAIaxxYasfgyKCpBjSPNuw== </ins> dependencies: minimatch "^3.0.4" semver "^7.3.5" <del> vscode-languageserver-protocol "3.17.1" </del> <ins> vscode-languageserver-protocol "3.17.2-next.5" </ins> <del> vscode-languageserver-protocol@3.17.1: version "3.17.1" resolved "https://registry.yarnpkg.com/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.1.tgz#e801762c304f740208b6c804a0cf21f2c87509ed" integrity sha512-BNlAYgQoYwlSgDLJhSG+DeA8G1JyECqRzM2YO6tMmMji3Ad9Mw6AW7vnZMti90qlAKb0LqAlJfSVGEdqMMNzKg== </del> <ins> vscode-languageserver-protocol@3.17.2-next.5: version "3.17.2-next.5" resolved "https://registry.yarnpkg.com/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.2-next.5.tgz#9bc747411c3ce9e1d73c2714bf6555e0199eec26" integrity sha512-UlH+QL4Q4lX94of/UPDDwwWIkd8w7dtMW4khzvEDUoykiG9tba0iG6V0bAiv8XVpnBIUYjL2FNFiL3zl+TY1Sw== </ins> dependencies: <del> vscode-jsonrpc "8.0.1" vscode-languageserver-types "3.17.1" </del> <ins> vscode-jsonrpc "8.0.2-next.1" vscode-languageserver-types "3.17.2-next.2" </ins> <del> vscode-languageserver-types@3.17.1: version "3.17.1" resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.17.1.tgz#c2d87fa7784f8cac389deb3ff1e2d9a7bef07e16" integrity sha512-K3HqVRPElLZVVPtMeKlsyL9aK0GxGQpvtAUTfX4k7+iJ4mc1M+JM+zQwkgGy2LzY0f0IAafe8MKqIkJrxfGGjQ== </del> <ins> vscode-languageserver-types@3.17.2-next.2: version "3.17.2-next.2" resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.17.2-next.2.tgz#af5d6978eee7682aab87c1419323f5b141ac6596" integrity sha512-TiAkLABgqkVWdAlC3XlOfdhdjIAdVU4YntPUm9kKGbXr+MGwpVnKz2KZMNBcvG0CFx8Hi8qliL0iq+ndPB720w== </ins> vscode-nls@^5.0.0: version "5.0.0"

}, "dependencies": { "@vscode/extension-telemetry": "0.5.1", <del> "vscode-languageclient": "^8.0.1", </del> <ins> "vscode-languageclient": "^8.0.2-next.4", </ins> "vscode-nls": "^5.0.1", "vscode-uri": "^3.0.3" },

"dependencies": { "vscode-css-languageservice": "^6.0.1", "vscode-html-languageservice": "^5.0.0", <del> "vscode-languageserver": "^8.0.1", </del> <ins> "vscode-languageserver": "^8.0.2-next.4", </ins> "vscode-languageserver-textdocument": "^1.0.4", "vscode-nls": "^5.0.1", "vscode-uri": "^3.0.3"

"dependencies": { "@vscode/extension-telemetry": "0.5.1", "request-light": "^0.5.8", <del> "vscode-languageclient": "^8.0.1", </del> <ins> "vscode-languageclient": "^8.0.2-next.4", </ins> "vscode-nls": "^5.0.1" }, "devDependencies": {

"jsonc-parser": "^3.0.0", "request-light": "^0.5.8", "vscode-json-languageservice": "^5.0.0", <del> "vscode-languageserver": "^8.0.1", </del> <ins> "vscode-languageserver": "^8.0.2-next.4", </ins> "vscode-uri": "^3.0.3" }, "devDependencies": {

vscode-nls "^5.0.1" vscode-uri "^3.0.3" <del> vscode-jsonrpc@8.0.1: version "8.0.1" resolved "https://registry.yarnpkg.com/vscode-jsonrpc/-/vscode-jsonrpc-8.0.1.tgz#f30b0625ebafa0fb3bc53e934ca47b706445e57e" integrity sha512-N/WKvghIajmEvXpatSzvTvOIz61ZSmOSa4BRA4pTLi+1+jozquQKP/MkaylP9iB68k73Oua1feLQvH3xQuigiQ== </del> <ins> vscode-jsonrpc@8.0.2-next.1: version "8.0.2-next.1" resolved "https://registry.yarnpkg.com/vscode-jsonrpc/-/vscode-jsonrpc-8.0.2-next.1.tgz#6bdc39fd194782032e34047eeefce562941259c6" integrity sha512-sbbvGSWja7NVBLHPGawtgezc8DHYJaP4qfr/AaJiyDapWcSFtHyPtm18+LnYMLTmB7bhOUW/lf5PeeuLpP6bKA== </ins> <del> vscode-languageserver-protocol@3.17.1: version "3.17.1" resolved "https://registry.yarnpkg.com/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.1.tgz#e801762c304f740208b6c804a0cf21f2c87509ed" integrity sha512-BNlAYgQoYwlSgDLJhSG+DeA8G1JyECqRzM2YO6tMmMji3Ad9Mw6AW7vnZMti90qlAKb0LqAlJfSVGEdqMMNzKg== </del> <ins> vscode-languageserver-protocol@3.17.2-next.5: version "3.17.2-next.5" resolved "https://registry.yarnpkg.com/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.2-next.5.tgz#9bc747411c3ce9e1d73c2714bf6555e0199eec26" integrity sha512-UlH+QL4Q4lX94of/UPDDwwWIkd8w7dtMW4khzvEDUoykiG9tba0iG6V0bAiv8XVpnBIUYjL2FNFiL3zl+TY1Sw== </ins> dependencies: <del> vscode-jsonrpc "8.0.1" vscode-languageserver-types "3.17.1" </del> <ins> vscode-jsonrpc "8.0.2-next.1" vscode-languageserver-types "3.17.2-next.2" </ins> vscode-languageserver-textdocument@^1.0.4: version "1.0.4" resolved "https://registry.yarnpkg.com/vscode-languageserver-textdocument/-/vscode-languageserver-textdocument-1.0.4.tgz#3cd56dd14cec1d09e86c4bb04b09a246cb3df157" integrity sha512-/xhqXP/2A2RSs+J8JNXpiiNVvvNM0oTosNVmQnunlKvq9o4mupHOBAnnzH0lwIPKazXKvAKsVp1kr+H/K4lgoQ== <del> vscode-languageserver-types@3.17.1, vscode-languageserver-types@^3.17.1: </del> <ins> vscode-languageserver-types@3.17.2-next.2: version "3.17.2-next.2" resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.17.2-next.2.tgz#af5d6978eee7682aab87c1419323f5b141ac6596" integrity sha512-TiAkLABgqkVWdAlC3XlOfdhdjIAdVU4YntPUm9kKGbXr+MGwpVnKz2KZMNBcvG0CFx8Hi8qliL0iq+ndPB720w== vscode-languageserver-types@^3.17.1: </ins> version "3.17.1" resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.17.1.tgz#c2d87fa7784f8cac389deb3ff1e2d9a7bef07e16" integrity sha512-K3HqVRPElLZVVPtMeKlsyL9aK0GxGQpvtAUTfX4k7+iJ4mc1M+JM+zQwkgGy2LzY0f0IAafe8MKqIkJrxfGGjQ== <del> vscode-languageserver@^8.0.1: version "8.0.1" resolved "https://registry.yarnpkg.com/vscode-languageserver/-/vscode-languageserver-8.0.1.tgz#56bd7a01f5c88af075a77f1d220edcb30fc4bdc7" integrity sha512-sn7SjBwWm3OlmLtgg7jbM0wBULppyL60rj8K5HF0ny/MzN+GzPBX1kCvYdybhl7UW63V5V5tRVnyB8iwC73lSQ== </del> <ins> vscode-languageserver@^8.0.2-next.4: version "8.0.2-next.4" resolved "https://registry.yarnpkg.com/vscode-languageserver/-/vscode-languageserver-8.0.2-next.4.tgz#c10cc95be06325b56b7ec1d10271c9e4adf3ef07" integrity sha512-B3roWH4TmJiB6Zh5+r7zu0QdlLqJsPdGo0LeEi6OiLfrHYCDlcI7DNcQ7F17vWmxC3C82SrxMt/EuLBMpKQM0A== </ins> dependencies: <del> vscode-languageserver-protocol "3.17.1" </del> <ins> vscode-languageserver-protocol "3.17.2-next.5" </ins> vscode-nls@^5.0.1: version "5.0.1"

dependencies: lru-cache "^6.0.0" <del> vscode-jsonrpc@8.0.1: version "8.0.1" resolved "https://registry.yarnpkg.com/vscode-jsonrpc/-/vscode-jsonrpc-8.0.1.tgz#f30b0625ebafa0fb3bc53e934ca47b706445e57e" integrity sha512-N/WKvghIajmEvXpatSzvTvOIz61ZSmOSa4BRA4pTLi+1+jozquQKP/MkaylP9iB68k73Oua1feLQvH3xQuigiQ== vscode-languageclient@^8.0.1: version "8.0.1" resolved "https://registry.yarnpkg.com/vscode-languageclient/-/vscode-languageclient-8.0.1.tgz#bf5535c4463a78daeaca0bcb4f5868aec86bb301" integrity sha512-9XoE+HJfaWvu7Y75H3VmLo5WLCtsbxEgEhrLPqwt7eyoR49lUIyyrjb98Yfa50JCMqF2cePJAEVI6oe2o1sIhw== </del> <ins> vscode-jsonrpc@8.0.2-next.1: version "8.0.2-next.1" resolved "https://registry.yarnpkg.com/vscode-jsonrpc/-/vscode-jsonrpc-8.0.2-next.1.tgz#6bdc39fd194782032e34047eeefce562941259c6" integrity sha512-sbbvGSWja7NVBLHPGawtgezc8DHYJaP4qfr/AaJiyDapWcSFtHyPtm18+LnYMLTmB7bhOUW/lf5PeeuLpP6bKA== vscode-languageclient@^8.0.2-next.4: version "8.0.2-next.4" resolved "https://registry.yarnpkg.com/vscode-languageclient/-/vscode-languageclient-8.0.2-next.4.tgz#87dd364ffbd4356aff3af14e7b557d9fe34d2b67" integrity sha512-j9BEiCYMN9IoKwYdk9iickV6WNPVGPoVO11SMdoxFnWPIT3y5UAe3qf/WsfA9OdklAIaxxYasfgyKCpBjSPNuw== </ins> dependencies: minimatch "^3.0.4" semver "^7.3.5" <del> vscode-languageserver-protocol "3.17.1" </del> <ins> vscode-languageserver-protocol "3.17.2-next.5" </ins> <del> vscode-languageserver-protocol@3.17.1: version "3.17.1" resolved "https://registry.yarnpkg.com/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.1.tgz#e801762c304f740208b6c804a0cf21f2c87509ed" integrity sha512-BNlAYgQoYwlSgDLJhSG+DeA8G1JyECqRzM2YO6tMmMji3Ad9Mw6AW7vnZMti90qlAKb0LqAlJfSVGEdqMMNzKg== </del> <ins> vscode-languageserver-protocol@3.17.2-next.5: version "3.17.2-next.5" resolved "https://registry.yarnpkg.com/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.2-next.5.tgz#9bc747411c3ce9e1d73c2714bf6555e0199eec26" integrity sha512-UlH+QL4Q4lX94of/UPDDwwWIkd8w7dtMW4khzvEDUoykiG9tba0iG6V0bAiv8XVpnBIUYjL2FNFiL3zl+TY1Sw== </ins> dependencies: <del> vscode-jsonrpc "8.0.1" vscode-languageserver-types "3.17.1" </del> <ins> vscode-jsonrpc "8.0.2-next.1" vscode-languageserver-types "3.17.2-next.2" </ins> <del> vscode-languageserver-types@3.17.1: version "3.17.1" resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.17.1.tgz#c2d87fa7784f8cac389deb3ff1e2d9a7bef07e16" integrity sha512-K3HqVRPElLZVVPtMeKlsyL9aK0GxGQpvtAUTfX4k7+iJ4mc1M+JM+zQwkgGy2LzY0f0IAafe8MKqIkJrxfGGjQ== </del> <ins> vscode-languageserver-types@3.17.2-next.2: version "3.17.2-next.2" resolved "https://registry.yarnpkg.com/vscode-languageserver-types/-/vscode-languageserver-types-3.17.2-next.2.tgz#af5d6978eee7682aab87c1419323f5b141ac6596" integrity sha512-TiAkLABgqkVWdAlC3XlOfdhdjIAdVU4YntPUm9kKGbXr+MGwpVnKz2KZMNBcvG0CFx8Hi8qliL0iq+ndPB720w== </ins> vscode-nls@^5.0.1: version "5.0.1"