we have an app in App Store Connect; we have 4 External Testing groups; we have testers, who are simultaneously in two or more groups; tester who consists in several groups can see all available builds in these groups on their device via TestFlight; I choose to remove the tester from one group; check this group - the tester is removed; check other groups - the tester remains in other groups; but checking the TestFlight on the device shows "tester removed" and NONE of the builds available before can be seen now.
According to this article: Removed testers will no longer have access to new builds added to this group in the TestFlight app. They’ll continue to have access to existing builds until they expire, but in fact we can see opposite behavior and the tester looses access to ALL groups and builds in TestFlight after being removed just from one of the groups. So the question is: is there a way to fix this? Or we misunderstand the explanation of "Remove testers from a group"?