Noticed this when I was flying around and was checking a pet in my bags and its tooltip kept bugging out so I started disabling addons and came to the conclusion that it was this addon that was causing the bug.
But it seems like it's only for battle pet tooltips from what I've found so far.

This is with Kui disabled: no issues

This is with Kui enabled: tooltip eventually bugs out

This is with only Kui enabled: bugs out

Does not happen on 2.29.17

Some more info that might help track down the issue: I found that it only happens in some zones, I first discovered this bug while doing the pre patch event in Dustwallow Marsh but if I'm in Stormwind for example it never bugs out here 🤔