Good point.
certainly, once it’s been recovered a couple of times it does have a detectable odor.
In my early outdoor cls days, anytime I saw a bee or wasp investigate the system, there was always a leak.
No.
But venting isn’t ideal either. So let’s explore a little.
I’m willing to bet your “butane” isn’t actually butane, and has up to 30% propane, and possibly isobutane in there.
See how temp and pressure compare to this graph (maybe check the whole thread).
Then we need to know exactly how much you loaded in there, and what the rest of the system looks like, and what volumes we have to play with.