pets like Grizzly Bear and Komodo Dragon act like if they weren't tamed toward other players, for example a tamed Grizzly Bear gonna attack other player if they approach, like if it weren't tamed
and tamed Komodo Dragons gonna attack other players without even being attacked before

in resume its a glitch that happens in multiplayer servers

This remains an issue. I've tamed a Grizzly Bear to show off to my friends and ended up killing my companion until I've set them to sit down. It seems like a constant that taming does not disable a mob's defensive nature.