Code change:
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"

Related discussion:
text: 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