I have a play-as-a-skeleton mod, which gives you a skeleton-oriented buff. It's buggy and keeps re-applying, but that's not the report here.
The report is when there's too many of these icons, it seems to interfere with clicking on things underneath it. This appears to be much thicker, up and down, than just the thin row, perhaps the layer intercepting the clicks is budgeting for info popup overlay space?
![[Linked Image from i.imgur.com]](https://i.imgur.com/OuD0wdf.jpeg)
It's a bit squirrely so there may be more to it than that, but that's my first guess.