13.4: sometimes exclamation mark (!) in corner of thumbnail
Starting awhile back, maybe 13.3 or 13.2, I started occasionally getting an exclamation mark (!) in the upper right hand corner on random thumbnails in grid view. I have been using Lightroom since version 4 so for 12 years or so. This problem never happened before, but now it happens fairly often. I am talking about photos that were imported before (days, weeks, months, years ago). It seems totally random. When it happens usually the photos before and after it in grid view do not have the !. And in every case there was no ! previously -- it just suddenly appears.

When I click on the ! I get this window:

Usually I select Import Settings from Disk. Sometimes if I have already done a lot (keywords, star ratings, comment, etc.) then I select Overwrite Settings.
This is all very annoying and it happens to a few random photos every time I use LrC these days.
[Moved from ‘Bugs’ to ‘Discussions’ by moderator, according to forum rules.]
