In the latest snapshot (24w18a) when the gamerule doMobSpawning is off, trial spawners do not work. Hopefully this is not "works as intended" as I didn't have this problem with normal spawners. Trying to make an adventure map without normal spawns and it heavily relies on the trial spawner. Video Proof
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We're actually already tracking this issue in MC-266487, so this ticket is being resolved and linked as a duplicate.
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