Ok here it is, biome: plains. Dimension: Overworld. i dont know if it is something specific to my game or something else, it just dont work like it should.
can confirm in 1.21.7
seed: 1019869349801327497
coordinates: (on nether) /tp @s 287.10 56.20 998.86
Using the following command:
/setblock ~ ~ ~ vault[ominous=true,]
Also exibits the same bug behavior than /setblock ~ ~ ~ vault[ominous=true]{config:{key_item:{count:1,id:"ominous_trial_key"},loot_table:"minecraft:chests/trial_chambers/reward_ominous"}}
. can confirm on 1.21.7
can confirm in 25w18a. it is still there.
if you are struggling with it, try exiting an entering the same world to examinate the issue better.