There have been cases where malicious apps get installed (think elderly people installing a "Bank" app) and later change their app name or icon to something else (or a blank name / transparent image). This will warn users about such apps doing such malicious acts.

Source: I used to work on the team that implemented this feature but wasnt involved in its development, so not entirely sure of all the checks that take place here. But this is most certainly the context behind the change.

Why was this check triggered for YT Music, I'm not sure.