App start block - android.os.RemoteException

[​ ​man]

I regularly check something in one app. I made a flow which saves current foreground package+activity, uses the "App start" block (with flag "Reorder to front") to start my app, checks something, then goes back to previously saved package+activity (using again "App start" block with flag "Reorder to front").

But after some time it stops going back to previously saved activity and my app stays in foreground. I see one error recurring:

08-12 11:17:15.271 F 9932530@213: android.os.RemoteException: Remote stack trace:

 at com.android.server.wm.ActivityTaskSupervisor.checkStartAnyActivityPermission(qb/98275673 de8329695e1bc756b4a122601024faf5ecbd66fab28e30fccd3a75993b49c32b:644)

 at com.android.server.wm.ActivityStarter.executeRequest(qb/98275673 de8329695e1bc756b4a122601024faf5ecbd66fab28e30fccd3a75993b49c32b:1382)

 at com.android.server.wm.ActivityStarter.execute(qb/98275673 de8329695e1bc756b4a122601024faf5ecbd66fab28e30fccd3a75993b49c32b:1122)

 at com.android.server.wm.ActivityTaskManagerService.startActivityAsUser(qb/98275673 de8329695e1bc756b4a122601024faf5ecbd66fab28e30fccd3a75993b49c32b:88)

 at com.android.server.wm.ActivityTaskManagerService.startActivity(qb/98275673 de8329695e1bc756b4a122601024faf5ecbd66fab28e30fccd3a75993b49c32b:120)

How can I fix this? 

[​ ​man]

The "App start" block used in both cases:

[Henrik "The Developer" Lindqvist]

AS the documentation say:

"Note! If this block cause a ActivityNotFoundException, SecurityException or otherwise fail it’s likely because the activity isn’t exported, it’s been temporarily or permanently disabled, or it’s secured by a permission to prevent third-party apps from launching it."