Ok, I’ve seen the following cases of this issue:
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Special periods of aggro. For example, 2 hours all the mobs (and thralls too) are not aggressive, then something triggers them (maybe entering a specific place?) and they are gaining aggro properly. So 2-3 hours of normal aggro - and then “pacifist mode” again
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Certain thralls are not attacking and some of them are normally agressive. For example, 3 of my thralls are just staying peacefully around the mob (that is attacking me) and 1 of thralls suddenly becomes aggressive and attacks the enemy.
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Mobs that are aggressive only for some players. For example, I walk somewhere (in jungles, in the north, whatever) with my clanmate and mobs are attacking only my clanmate (and for me they are not agressive at all). Then after 1-2 hours they become aggressive for me too.
Official PVE #1053 server.