[Xposed General] siealex:
The same for me, Xposed modules are still working, but Xposed Installer says Xposed is not installed. Magisk 16.4 (1642), Nexus 5x, stock 8.1 rom.

04-29 22:31:03.491 I/Xposed ( 576): -----------------
04-29 22:31:03.491 I/Xposed ( 576): Starting Xposed version 90.1-beta3 (Systemless), compiled for SDK 27
04-29 22:31:03.491 I/Xposed ( 576): Device: Nexus 5X (LGE), Android version 8.1.0 (SDK 27)
04-29 22:31:03.491 I/Xposed ( 576): ROM: OPM2.171019.029
04-29 22:31:03.491 I/Xposed ( 576): Build fingerprint: google/bullhead/bullhead:8.1.0/OPM2.171019.029/4657601:user/release-keys
04-29 22:31:03.491 I/Xposed ( 576): Platform: arm64-v8a, 64-bit binary, system server: yes
04-29 22:31:03.491 I/Xposed ( 576): SELinux enabled: yes, enforcing: yes
04-29 22:31:03.523 I/Xposed ( 576): -----------------
04-29 22:31:03.523 I/Xposed ( 576): Added Xposed (/system/framework/XposedBridge.jar) to CLASSPATH
04-29 22:31:07.216 I/Xposed ( 576): Detected ART runtime
04-29 22:31:07.218 I/Xposed ( 576): Found Xposed class 'de/robv/android/xposed/XposedBridge', now initializing
04-29 22:31:07.666 I/Xposed ( 576): Loading modules from /data/app/com.pyler.youtubebackgroundplayback-dNqS_6-8G6ZmStmgRPfRfg==/base.apk
04-29 22:31:07.678 I/Xposed ( 576): Loading class com.pyler.youtubebackgroundplayback.YouTubeBackgroundPlayback
04-29 22:31:07.681 I/Xposed ( 576): Loading modules from /data/app/com.android.vending.billing.InAppBillingService.COIN-IlJLMXCh8UmJ95KjWbjXVQ==/base.apk
04-29 22:31:07.871 I/Xposed ( 576): Loading class com.chelpus.XSupport
04-29 22:31:07.895 I/Xposed ( 576): Loading modules from /data/app/com.vikas.toaststyler-E5QY1pijAQyQPbJVWOGWVQ==/base.apk
04-29 22:31:07.978 I/Xposed ( 576): Loading class com.vikas.toaststyler.XtoastMod
04-29 22:31:08.019 I/Xposed ( 576): Loading modules from /data/app/com.pavlyukoff.xposed.fingerprintenabler-PFBqMJOe76nh4-TAXBgskw==/base.apk
04-29 22:31:08.028 I/Xposed ( 576): Loading class com.pavlyukoff.xposed.fingerprintenabler.XposedClass
04-29 22:31:08.029 I/Xposed ( 576): Loading modules from /data/app/tw.fatminmin.xposed.minminguard-KErDq_YnGqDzNIZ0AQ4biQ==/base.apk
04-29 22:31:08.172 I/Xposed ( 576): Loading class tw.fatminmin.xposed.minminguard.Main
04-29 22:31:08.241 I/Xposed ( 576): Loading modules from /data/app/com.ceco.oreo.gravitybox-GWTVZm6Sm6QZcxzd6Lb9qA==/base.apk
04-29 22:31:08.341 I/Xposed ( 576): Loading class com.ceco.oreo.gravitybox.GravityBox
04-29 22:31:08.354 I/Xposed ( 576): GB:Hardware: bullhead
04-29 22:31:08.354 I/Xposed ( 576): GB:Product: bullhead
04-29 22:31:08.354 I/Xposed ( 576): GB:Device manufacturer: LGE
04-29 22:31:08.354 I/Xposed ( 576): GB:Device brand: google
04-29 22:31:08.354 I/Xposed ( 576): GB:Device model: Nexus 5X
04-29 22:31:08.358 I/Xposed ( 576): GB:Device type: phone
04-29 22:31:08.359 I/Xposed ( 576): GB:Is MTK device: false
04-29 22:31:08.359 I/Xposed ( 576): GB:Is Xperia device: false
04-29 22:31:08.359 I/Xposed ( 576): GB:Is Moto XT device: false
04-29 22:31:08.359 I/Xposed ( 576): GB:Is OxygenOS ROM: false
04-29 22:31:08.359 I/Xposed ( 576): GB:Has telephony support: true
04-29 22:31:08.359 I/Xposed ( 576): GB:Has Gemini support: false
04-29 22:31:08.359 I/Xposed ( 576): GB:Android SDK: 27
04-29 22:31:08.359 I/Xposed ( 576): GB:Android Release: 8.1.0
04-29 22:31:08.359 I/Xposed ( 576): GB:ROM: OPM2.171019.029
04-29 22:31:08.359 I/Xposed ( 576): GB:Error logging: false
04-29 22:31:13.751 I/Xposed ( 577): -----------------
04-29 22:31:13.752 I/Xposed ( 577): Starting Xposed version 90.1-beta3 (Systemless), compiled for SDK 27
04-29 22:31:13.752 I/Xposed ( 577): Device: Nexus 5X (LGE), Android version 8.1.0 (SDK 27)
04-29 22:31:13.752 I/Xposed ( 577): ROM: OPM2.171019.029
04-29 22:31:13.752 I/Xposed ( 577): Build fingerprint: google/bullhead/bullhead:8.1.0/OPM2.171019.029/4657601:user/release-keys
04-29 22:31:13.752 I/Xposed ( 577): Platform: arm64-v8a, 32-bit binary, system server: no
04-29 22:31:13.752 I/Xposed ( 577): SELinux enabled: yes, enforcing: yes
04-29 22:31:13.759 I/Xposed ( 577): -----------------
04-29 22:31:13.759 I/Xposed ( 577): Added Xposed (/system/framework/XposedBridge.jar) to CLASSPATH
04-29 22:31:15.098 I/Xposed ( 577): Detected ART runtime
04-29 22:31:15.100 I/Xposed ( 577): Found Xposed class 'de/robv/android/xposed/XposedBridge', now initializing
04-29 22:31:15.382 I/Xposed ( 577): Loading modules from /data/app/com.pyler.youtubebackgroundplayback-dNqS_6-8G6ZmStmgRPfRfg==/base.apk
04-29 22:31:15.390 I/Xposed ( 577): Loading class com.pyler.youtubebackgroundplayback.YouTubeBackgroundPlayback
04-29 22:31:15.393 I/Xposed ( 577): Loading modules from /data/app/com.android.vending.billing.InAppBillingService.COIN-IlJLMXCh8UmJ95KjWbjXVQ==/base.apk
04-29 22:31:15.584 I/Xposed ( 577): Loading class com.chelpus.XSupport
04-29 22:31:15.608 I/Xposed ( 577): Loading modules from /data/app/com.vikas.toaststyler-E5QY1pijAQyQPbJVWOGWVQ==/base.apk
04-29 22:31:15.681 I/Xposed ( 577): Loading class com.vikas.toaststyler.XtoastMod
04-29 22:31:15.705 I/Xposed ( 577): Loading modules from /data/app/com.pavlyukoff.xposed.fingerprintenabler-PFBqMJOe76nh4-TAXBgskw==/base.apk
04-29 22:31:15.713 I/Xposed ( 577): Loading class com.pavlyukoff.xposed.fingerprintenabler.XposedClass
04-29 22:31:15.714 I/Xposed ( 577): Loading modules from /data/app/tw.fatminmin.xposed.minminguard-KErDq_YnGqDzNIZ0AQ4biQ==/base.apk
04-29 22:31:15.855 I/Xposed ( 577): Loading class tw.fatminmin.xposed.minminguard.Main
04-29 22:31:15.939 I/Xposed ( 577): Loading modules from /data/app/com.ceco.oreo.gravitybox-GWTVZm6Sm6QZcxzd6Lb9qA==/base.apk
04-29 22:31:16.037 I/Xposed ( 577): Loading class com.ceco.oreo.gravitybox.GravityBox
04-29 22:31:17.060 I/Xposed ( 1160): GB:Is AOSP forced: false
04-30 09:48:09.174 I/XposedInstaller( 7402): Downloaded [url]http://dl.xposed.info/repo/partial/14807.xml.gz[/url] with status 0 (error: null), size 43450 bytes
04-30 09:48:09.627 I/XposedInstaller( 7402): Updated repository [url]http://dl.xposed.info/repo/full.xml.gz[/url] to version 14837 (19 new / 0 removed modules)

I don't see anything strange in these logs.