This is a known issue that is mentioned in the 1.21.0.20 changelog, which is recommended to read for anyone using the preview.
Please do not comment on this issue.
In trial_chambers, treasures appear without resources inside.
What needs to be done:
You create a world, find trial_chambers, go to the treasury, press it with the key.
What should happen:
It opens and objects fall out.What's going on:
It does not open, and nothing falls out, because it was created without loot.
Linked issues
is duplicated by 14
Attachments
Comments 10

Step to Reproduce:
Create new world
/locate structure trial_chamber
Can't open vault without loot 1.21 Preview
Step to Reproduce:
Create new world
/locate structure trial_chamber
Can't open vault without loot 1.21 Preview
This is a known issue stated in changelog:
Known Issue: Vaults in Trial Chambers may generate without loot and cannot be opened by Trial Key
Just to provide a bit of clarification: The naturally generated vaults have no loot at all and cannot even be unlocked with a trial key at all. Thus, not just do you get nothing when using a trial key, the trial key cannot even be used at all, and the vault doesn't show a preview of the items it will drop.