Why? Because intermittent issues with mechanical systems are VERY rare. Mainly because the dimensions of the parts do not change (maybe a bit with extreme temp changes)
To have in intermittent cylinder rotation means the contact between the hand and cylinder spur changes randomly. Obviously the dimensions of these parts do not change. There is Spring pressure that holds the hand in the forward position. Insufficient spring pressure? Maybe, but the metallurgy would be to blame there. That is certainly in the realm of possibility but I would think it would be more repeatable. If the issue was isolated to one spur on the cylinder the issue would be 1/6 of the trigger pulls. Also, note how the issue goes away when the ammo was removed from the gun? There is a clue there... also I can MAKE the gun act this way 100% of the time if I want. So because I can repeat this condition on demand I consider that another clue.
As far as the transfer bar being the root cause of light primer strikes... maybe. But again, that would mean that the transfer bar alone was intermittently changing how it was interacting with the rest of the gun. So a metallic part with set dimensions was intermittently having issues with a specific brand of budget ammo? I would love to see the engineering report that states that and the manager that accepts it. A spring I could buy into. But again people that have this issue should try other brands to see if the issue is still present.
All I am saying is I wouldn’t condemn a $1,500 gun because I choose to purchase the cheapest ammo available and then act surprised because I have unreliable ignition. It’s cheap range Ammo we shoot for fun and if you really start to take a closer look at it you can spot all kinds of issues with inconsistent bullet seating depth, crimping, and poor quality of case rims. Typically a gun digests this with no issues but not always.
Real troubleshooting looks at all the variables involved. And if the problem can’t be duplicated then it’s not untypical to replace the components of the suspect system and hope for the best.
All that being said, i encourage anyone that is tightening the side plate up to 1st remove it and take a few pics and post them. It would be interesting to see the difference in parts as the 2020Py evolves. We have already seen the DA spur change in just the 1st 2,000 units.