The head torches that spawn on zombies are not working as intended I think.

First off, the batteries inside are always full.

And second, on roughly 4/5 headtorches I am not able to take the batteries out of the headtorch.
I cannot make out, what the exact parameters are that have to be met, so that I am able to take the battery out.
It is not the condition of the torch or battery, it is not the position (on zombie or on ground or in hands) and not the state (turned on or off).
Trying to double left-click or drag does not make a difference either.