This has been noted as a duplicate of MC-269969
I was testing out the new Ominous Chambers, and I attempted to unlock an Ominous Vault with a Trial Key, not an Ominous Key. I still got the achievement Under Lock and Key. Here's an image.
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This is a duplicate of MC-269969.
Noted as a Duplicate. This already has another report in its place or has something relating to another bug report.