I read about this gun - IIRC, the cause was determined to be a flaw with the gun itself. There was something wrong with the mechanism that rotates the cylinder. When the cylinder rotated, the chamber wasn’t properly aligned with the barrel thus causing the explosion...again, IIRC...
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That or a barrel obstruction was what I was thinking, the round blew out the cylinder walls and ignited both adjacent rounds (note that one bullet barely protrude beyond the cylinder). The amount of damage also suggests a double charge.
I had a .357 Colt once that developed severe leading after only a few round and accuracy was very poor. When I examined the gun further I determined that the cylinder had to be locked up manually when cocked.
Worked fine after the factory repaired it but never liked shooting it and traded it for a heavier framed S&W.