[MC-273812] Intersection chests in trial chambers not generating correctly

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Intersection loot chests in trial chambers only spawn with iron blocks, diamond, and cake instead of from the intended loot table. When running the /loot command it generates correctly, but not in the structures (see attached images).

Steps to Reproduce:

Generate the "corridor/end_1" trial chambers structure by using the command provided below.
```
/place template minecraft:trial_chambers/corridor/end_1
```
Open the chest below the stairs and observe how an iron block, a cake, and a diamond always generates.