long time issue, because the AI always try to get in formation. If one guy is stucking, the whole group do nothing. Because of this, i always check the group and if one is stucking, i teleport him to the rest of the group.

Yes, long reported issue. This also happens if lets say you have a squad and you end up dying, but the squad or parts of the squad are still alive. If you were to then try and get a new squad after respawn, the new squad will be percieved to "not follow orders" as they will try to regroup with the old squad whom is still alive.

The behavior itself makes sense but doesn't function well or nor is it really communicated to the player at all.