The warden will behave normally if you summon it in creative with no mobs nearby. However, the warden will continue to sniff for no reason after it encounters and kills a mob, which is inconsistent and annoying.
Linked issues
Attachments
Comments 2
Except that the excessive sniffing is also caused after the Warden kills a mob, which is different from MC-249430.
I believe this is MC-249430.