It actually is clearly set out in IATA rules for DG on aircraft - it's just that it doesn't really happen often enough to get attention that it needs. The issue is the local staff not knowing that it is in fact ok and giving passengers a harder time for it than they really should. It's the same with medical oxygen that some passengers need to fly with - the rules are quite set and all above board but it's still hard work.
Example of the drama that can happen, I had a passenger spill a beef glycerine health product in the form of a white powder on an aircraft, the container had got squashed and the lid popped off in her bag and the safety seal let go and it leaked. White powder down the aircraft aisle, and on the apron... That was dramatic with a full white powder incident about to be called and the cavalry charging in which is when I got asked for advice. Stupidly I just asked the passengers if anyone had a white powder type thing in their bags - "oh, yes I do - my health supplement. Oh, it's leaked...". That was a bit embarrassing for the people involved as they were left standing there with a stick vac and a lot of people wondering what the panic was about.
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