Just like described, editing a post with a pic inside results in not being able to send it because of the dimension error unless the min / max setting is 0x0.
Also some user avatars are not being displayed after conversion although they are well in the allowed dimensions. Not sure if this is caused by the same mechanism, as theses avatars will not be displayed nevermind the min/max setting for avatars. (The missing avatars do appear as small preview in UCP though, but not in postings.)
I didn't bother to look into the given tickets, presuming they have been integrated in 3.28 long ago- or am I wrong?
Posting it here because of this parallel: