Trial Spawners don't work in Trial Chambers generated with /place

When generating the Trial Chambers using /place, the Trial Spawners spawn and stay inactive, and can't even changed to "waiting_for_players" using the debug stick, because it instantly resets to "inactive".

Steps to Reproduce:

1. Generate Trial Chambers using "/place structure trial_chambers"
2. Find a Trial spawner
3. (optional) Right-click it with a spawn-egg
4. Try changing the state of the spawner with the debug stick to "waiting_for_players"

 

Observed Results:

The Trial Spawner shortly changes its state to "waiting_for_players", but returns to "inactive" after one game tick.

 

Expected Results:

The Trial Spawner should stay at the state "waiting_for_players", until it is activated and thus spawns mobs.