Trial Spawner keeps flashing after cooldown ends

Trial Spawner will flash after the cooldown ends (after 30 minutes).

I tested it on the vanilla server, LAN World, and single player mode and the results were the same.

Steps to reproduce:

1. Place a Trial Spawner on the ground, then use a spawn egg (e.g. wolf).
2. Switch to Survival Mode, activate Trial Spawner, then clean up the spawned mobs and wait 30 minutes within the Trial Spawner activation range.
3. Then the Trial Spawner starts flashing.

MC-274265

The problem is that I don't want to wait 30 minutes to trigger this bug, so I used a Debug Stick in the previous problem.

Here is a video showing the same effect, but not using a vanilla server.(I really don't want to wait another 30 minutes, sorry)

https://github.com/PaperMC/Paper/issues/11039