This flys in the face of thousands of striker fired guns being carried safely with a round in the chamber. Assuming the gun has no design flaws, and I know of several that don't, the simple carrying the gun with a round in the chamber is not an issue. The guns have firing pin blocks for a reason.
I don't have a dog in the show so I really don't care but to the fellow with the Gen 5 Glock, you should know the Gen 5 Glock has a new trigger group, frame and slide completely different than the previous generations. Some would say it is a new pistol that looks like the former designs. If you are sure the AD happened as you describe I would have the gun looked at by a Glock armorer at the very least and advise Glock of what happened. Your gun should not have done what it did.
My PPQ M2 Five inch went full auto on me at a match. The local Walther importer was kind enough to replace the sear block on MY dime or more to the point about $150 time I paid postage. There is no lifetime warranty with the PPQ in Canada. These guns are made with safety in mind. When they do something that they should not do then something is wrong with the particular gun. When it happens to others then maybe there is a problem the design or certain parts.
Take Care
Bob
ps The PPQ in question has worked properly since the sear block replacement and my PPQ Match has had no issues. Great guns but sometimes even the best of guns can have an issue.