Use a placeholder block does not matter which.

1. Use a /setblock command using the coords of the block you're replacing or setting at.
2. Type in its block state ["ominous"=true]
3. Try to interact with it with an ominous trial key. Then afterwards, use the default trial key; its properties are shown upon usage.

Expected Result:

When setting a vault down using the/setblock command using the "ominous"=true code, its properties should be changed to the appropriate variant using the Ominous Trial Key and its loot table.

Observed Result:

Setting down a vault with those properties only changes it cosmetically, not its actual properties with its behavior, interaction, and loot table.