The Bug
When you try to summon the Warden with the command:
/summon minecraft:warden ~ ~ ~ {Brain: {memories: {"minecraft:is_emerging": {value: 1b, ttl: 85L}, "minecraft:last_disturbance": {value: 311069L, ttl: 1151L}}}}
It instantly digs down.
I know there's the #MC-249393, and it's marked as "Won't Fix", but it's also suggested a workaround by the reporter, adding the following NBT line to the command:
{"minecraft:dig_cooldown":{value: {}, ttl: 1200L}}}
And it also instantly digs down.
Thank you for your report!
We're tracking this issue as MC-249393, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Won't Fix, which means this is considered a bug but won't be fixed. The description of that ticket or the comments might explain the rationale. Please do not leave a comment on the linked ticket.
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