Affects Version/s: 1.16.1, 20w28a
Fix Version/s: None
Any mob with the tag Team shouldn't attack you if you belong to their team, same with mob to mob.
A example with a pillager:
Put in the chat
/team add white_all
/team join white_all @s
/team join white_all @e[type=pillager]
And presto, the pillager shouldn't attack you because is your team, It doesn't matter if you hit him, he'll never attack you.
This work with zombie, skeleton, creeper... etc. And even special mobs like the vindicator "Jhonny" and The killer bunny.
But with a Piglin /Piglin Brute /Hoglin /Zoglin doesn't work, still attacking you.