[Bug] UnitFrames's Focus- and Target-Castbar visibility can become stuck

[Thovald]

Hi,

when targeting or focus-targeting a new unit, it is possible for the associated UnitFrame's castbar to become visible, even though the unit isn't casting anything.

Steps to reproduce the focus castbar getting stuck:

1. Find a spell-casting unit and target it.
2. Find another unit that isn't casting anything.
3. While your target is casting/channeling a spell, set the other unit as your focus.
4. The focus's castbar will become visible, even though that unit isn't casting.

I've confirmed this happening with only EllesmereUI's UnitFrames being loaded as well as with the default profile.
It is possible for the target castbar to get stuck in a similar fashion, but I have been unable to find a way to reproduce it.
This doesn't happen with the target and focus castbars in the Mythic+Tools module.
A good spot to troubleshoot this is at Nar'Thalas Academy in Azsuna.

Wow_2026_09_05_16h29m29s.mp4