Warden doesn't count towards Monster Hunter advancements

First reported in MC-248658, but this was created in the experimental snapshot. [Helper] markderickson said to create a new report if a new one doesn't currently exist for a current version. The only report I could find was MC-248658, so I created this post.

This might be intended, since the Warden isn't something players are meant to kill. I just created it in case it isn't intentional.

The bug:
The Warden doesn't count towards "minecraft:adventure/kill_a_mob" advancement and most likely also doesn't count towards "minecraft:adventure/kill_all_mobs" advancement.

Steps to reproduce

• /advancement revoke @s everything (just to make sure you haven't gotten the advancement already)
• /summon warden
• /data modify entity @e[type=warden,limit=1] Health set value 1
• /gamemode survival (if you aren't in survival already)
• Punch the warden. It should die in one hit because its health is 1

Observed Results
The player doesn't get the advancement

Expected Result
The player should get the advancement