Obviously the reason for the gas explosion will be revealed after investigation.
Before a long trip out, I do a tightness test below the kitchen worktop, also apply leak detection spray at joints I can access.
Tank change over, same again, apply leak detection spray where the regulator make thread is located into the tank female thread. And while in the gas locker, the joints are given a liberal spray too.
I do get a tad paranoid about these things, hence the checks, especially at tank change overs.