What does the exclamation mark mean in front of a pluginkit listing?

I am trying to build an app with Xcode 12.5 Beta 3 on macOS Big Sur 11.2.2 with a file provider extension. I use the beta version of Xcode because previous versions do not provide a template for file provider extensions.

The app and its extension have a common app group set up in their entitlements and are signed automatically with my personal team and a development certificate.

I build and run my app and extension. As far as I know, I have now control over when it is (un)loaded because that is up to the system.

Observations

1. The extension never shows up in the system preferences.

2. The Console app does not provide any meaningful information. The only message with the distinct project name reports "*** (LaunchServices)" to check whether the application is managed.

3. The extension does not show up in the Activity Monitor.

4. Pluginkit reports the extension to be found but prepends an exclamation mark (when running pluginkit -vvvvmi Redacted.Hyperdrive.File-Provider).

Code Block  lang-sh
$ pluginkit -vvvvmi Redacted.Hyperdrive.File-Provider                                                                                                                        
!    Redacted.Hyperdrive.File-Provider(1.0)
	            Path = /Users/peter/Library/Developer/Xcode/DerivedData/Hyperdrive-gyfstlzpcwfgdyapkdbdsqcvxmae/Build/Products/Debug/Hyperdrive.app/Contents/PlugIns/File Provider.appex
	            UUID = FD87EE6B-8C82-4DFB-AF85-E9A1808517C6
	       Timestamp = 2021-03-09 10:47:35 +0000
	             SDK = com.apple.fileprovider-nonui
	   Parent Bundle = /Users/peter/Library/Developer/Xcode/DerivedData/Hyperdrive-gyfstlzpcwfgdyapkdbdsqcvxmae/Build/Products/Debug/Hyperdrive.app
	    Display Name = File Provider
	      Short Name = File Provider
	     Parent Name = Hyperdrive
 (1 plug-in)

Problem

I did not find anything about the meaning of the exclamation mark or how to find out what the actual problem is.

Remark

For whatever reason the developer forum appears to censor the acronym of the launch services daemon with three asterisks. 🙄

+ indicates that the user has elected to use the plug-in
- indicates that the user has elected to ignore the plug-in
! indicates that the user has elected to use the plug-in for debugger use
= indicates that the plug-in is superseded by another plug-in
? unknown user election state