Piston compression rings seal on the inside top edge and the bottom outside edge of the ring lands under compression and just the opposite when the is cylinder firing or on the intake stroke, I think. That is what I have figure out anyways,
So here goes on the rings sealing and breaking in, as the crankshaft, pistons and rods rotate the pressures inside the cylindes change on every stroke from sucking in and pushing up or down, the piston stops twice on each stroke so there is negative pressure on the rings and piston ringlands, they float in the transession from up to down motion
So that is when the rings can rotate a small amount in the ringlands. I have assemble and dyno tuned a lot of motors and then took the motors apart for inspection before racing them or giving them to the customer. I have seen rings move all the way around the pistons, I have also seen them end up with the rings gaps aligned on some cylinders and not on others
I'm sure that at some time the rings stop moving or rotating in the ringlands, but maybe not
IHTHs
BTW, I have taken race motors apart after several hundred runs for inspection that leak down well, had no damages to the cylinder walls, pistons or rings so I put back together and race them some more
Some of them went over four hundred runs + bracket racing before needing reringing and honing
That is with the air cleaners on and good maintenance on the engine