It looks like the latest update broke BIS_fnc_ambientAnimCombat.
For example, in the init of unit I use it:
[this,"WATCH","FULL"] call BIS_fnc_ambientAnimCombat;
Or that:
[this,"STAND","FULL"] call BIS_fnc_ambientAnimCombat;
but always the soldier's night vision device disappears. It worked reliably before