This is new as of version 18. It’s unclear to me whether it’s intentional or a bug, but several players have reported it as a bug. Personally, I agree that it doesn’t seeming it was an intentional change, and find it a bit annoying.
Originally many of those reports were in this thread:
But that thread evolved to contain other bugs as well, so @Petri suggested making separate bug reports, and closed that thread:
@Kerridoc @Rook Is there a master thread now for the special showing that it’s maxed every time a hero is fed at all? Or should this new thread from @danis1 be the master now?