Chest minecarts from mineshafts can generate in trial chambers

Trial chambers overlap mineshafts, but chest minecarts can still spawn within them.

To reproduce, use the seed -4204445020292425999 and run the following command:

/execute in minecraft:overworld run tp @p -144 -28 -367 0 45

/execute in minecraft:overworld run tp @p -144 -28 -367 0 45