Getting plugin is not implemented with Capacitor 5

I'm getting the following error messages with Capacitor 5, when building for Android.

• Uncaught (in promise) Error: "SafeArea" plugin is not implemented on android
• Uncaught (in promise) Error: "Network" plugin is not implemented on android

This only happens when building a signed APK for production... this does work fine when using cap sync && cap run android.

• I already ran pnpm cap sync android... and syncing my files with Android Studio does not modify anything

This worked:

• removing the android folder
• upgrading all the dependencies (especially the capacitor ones)
• running cap add android

rebuild the app