Describe the bug
Entering an arena while in combat generates a UI error and the arena frames won't be shown during arena preparation.

How to reproduce

1. Use an oUF layout that has arena frames.
   2a. Queue for arenas or arena skirmish.
   2b. Engage in combat with a target dummy, or any mob.
2. Click "enter" on the arena queue popup while in combat.
3. Success! No unit frames and a bug in the bugsack

What did you expect?
I wouldn't expect there to be any issue generating arena frames since I'll have(hopefully?) left combat as soon as I phased out of the open-world.

Error report

1x [ADDON_ACTION_BLOCKED] AddOn 'oUF' tried to call the protected function 'SecureStateDriverManager:SetAttribute()'.
[string "@!BugGrabber\BugGrabber.lua"]:519: in function <!BugGrabber\BugGrabber.lua:519>
[string "=[C]"]: in function `SetAttribute'
[string "@FrameXML\SecureStateDriver.lua"]:48: in function `UnregisterUnitWatch'
[string "@oUF\ouf-10.0.3.lua"]:178: in function `Disable'
[string "@oUF\units.lua"]:136: in function <oUF\units.lua:98>
[string "=[C]"]: ?

My layout is using a for loop to generate the frames, but I don't know if that has any importance:

local Arena = {}
for n=1, MAX_ARENA_FRAMES or 5 do
Arena[n] = self:Spawn("arena" .. n, addonName .. "arenaFrame" .. n)
--SetPoint(), etc
end

@catthou Sorry for the delayed response, are you still experiencing this issue?

While the error is presented by the arena prep code I made, we should probably look into ensuring the player is not in combat lockdown when disabling a frame.

Let me know if I can help contribute anything else. I do arenas regularly so it wouldn't be out of my way to test fixes.

Jumping in to track this - using elvui with a similar issue where arena prep frames sometimes do not appear.

Specifically for this issue, i am unable to reproduce this exact use case with the given steps.
No error is produced, and arena prep frames are shown (in most cases apart from the as yet unknown reason for them sometimes not appearing, with no error given)