I noticed this behavior today. It seems that the appear animation for tooltips is not the same for all the elements in the taskbar. Video attached shows how some appear from the left, others from the right, others from the top, etc. Not sure if the team is aware.
Please attach the video.
Sorry about that. The video was too big. I thought it had been attached. Here is a link to it: https://collaborate.kde.org/s/g8HJGdyJ7nNaX7H
If you disable the "Morphing Popup" effect in the Desktop Effects KCM, does the bug go away?
When I do that, the slide animation goes away, but I get a weird stutter on the appear effect for the tooltip. Video attached. The behavior is still inconsistent across the panel.
https://collaborate.kde.org/s/myxxKwYFfBJqnjE
Interesting, thanks. That suggests it's not an issue with that KWin effect.
This looks like it's not the same thing but may be related to https://bugs.kde.org/show_bug.cgi?id=447476
This is "fixed" by deleting the Morphing Popups effect in Plasma 6.2.0