ActivityStarter1.ResolveActivity always returns an empty string in Android 11

[menester]

I have two AI2 apps (ie app A and app B).
Shortly after startup, app A looks to see if app B is installed (not running, just installed).
If app B is not installed, a particular tinyDB tag is set to '5'.
If app B is installed, that same tinyDB tag is set to '0'.

App A never, ever, ever needs to start app B.
App A only needs to know that app B is installed.

My search of forum topics indicated that in Android 11, ActivityStarter1.ResolveActivity always returns an empty string (in my case, indicating app B is not installed).
My apps work on Androids < 11.
How do I get it to work with Android 11?

[Anke]

Yes, also on Android 12. But it returns an empty string:

No results on Android11 ResolveActivity from ActivityStarter

Yes, on devices with Android 11 .ResolveActivity is an empty string. However, there is no need to check this as every device has an MP3 (audio) player. Android 9 (above) Android 11 (below): [grafik]