When a piglin and a hoglin are in the same team (generated with commands) they still attack each other. A zoglin attacks all the other creatures even if they are in his team. These two observations remain valid even when the friendlyfire in a team is disabled. In comparison when a wolf is adopted he takes the team of the player who adopted him and if a skeleton is on that player’s team, he’s not scared of the dog anymore.

 When a piglin becomes a zombified_piglin, a hoglin a zoglin and a zombie a drowned and they have a predefined team, after their transformations they lose their teams and stay without team.