If you summon Warden with custom health , item in hand , drop , speed or anything esle
or summoning warden riding other mob. warden will straight away dig him self up into the ground.

But i found out if you do that same command but instead of summoning warden

giving your self and egg .. its going to be fixed

Video of me explaining the bug : https://www.youtube.com/watch?v=TZi4df9dKBU