The Trial Chambers sometimes still generate with empty chests, despite the added new barrel/hopper disposals. You can check on some of the structure here in the seed and coords below:
4290981130191564196
311.59 -22.64 57.09
-394.48 -20.54 88.83
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These remaining empty chests in the trial chamber should either have loot in them, converted to barrels and hoppers, or removed from the trial chamber.