I have a weird issue non-driving (well you can't drive with it), don't know if it is a 12.3 vs 12.31.1 thing or just a thing with the cars.
We have a 3 and Y and as far as I could tell the seat positions for those were independent.
Well with a loaner 3 in my account, I've discovered that Tesla appears to share profiles between the "same" car type.
The problem is the loaner 3 translated my seat back position to be full bent over. When I got in initially, I thought it was just a bad Easy Entry profile from the previous user. So, I "fixed" and saved my position in the loaner. When I got in to our model 3 and it recognized my profile it put the seat back, way back. It looks like it took the sync'ed profile and applied it incorrectly.
Basically, it looks like the two cars offset from each other what they think a give position on the seat (back) is.
There is clearly a bug somewhere.