BattlEye kicks players for setVariable #0 restriction for the variable "saved3DENInventory". This seems to be set by the engine - we could not find it in all Arma .sqf files, none of our code, not in the mission.sqm or anywhere else. We cannot filter for it. It kicks players after a couple of seconds after they have joined the server.
This variable is mentioned here https://dev.arma3.com/post/spotrep-00056, but that is all information available on it.
1.62 stable release.