Wardens can crawl out and dig in the some illegal blocks that are not normally obtained to survival mode players.
This can cause a lot of trouble for game map creators.
May cause wardens to spawn in places not intended by the map creators.
Affected illegal blocks:
Bedrock
Barrier
Command block
Chain command block
Repeating command block
End portal frame
Spawner
Structure block
Related issues
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Might be intended due to the fix of MC-249384.
In fact, I found this problem in the experimental snapshot, and I just recalled it and created the ticket.