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.