Some years ago, I was working as factory fireman, and during a training course with PETANS (North Sea Rigs fire training), these GAZ canisters came up for discussion.
The small disposable type, which rely on being pierced by the lamp or burner assembly seem particularly dangerous, as at that time, apparently, they were suffering from corrosion, at the joint between the convex base and the top pressing. This could only just be seen, if you turned the cylinder upside down and examined this joint.
What happened in several incidents; was the sudden drop in pressure, caused by the cylinder being pierced by the insertion of the top of the unit, "flexed" the bottom plate , the corroded joint started to come apart and leak, causing the unit to explode when lit, even when assembled correctly.
As part of the course, we "set off" several of these corroded cylinders; quite an explosion they produced.
The thing was, at the time I was quite a keen hill walker, and had several of these GAZ containers stored in my shed !w
Sure enough they were all corroded, so were set off at the next session.
I've not used this type of appliance since, as I believe the "spraycan" gas containers are safer to use, provided the rubber O rings fit properly and are in good condition.