we were one of the first Y owners in 2020 (took delivery in July) - we have filed and got a number from NHTSA - NHSTA Tesla Issue No. 11447921 atWhat is you build date and VIN? Assuming this was a casting issue, there is a recall already in motion for control arm casting I believe, but it didn't affect my build, so I don't remember exactly the VIN range. I have to think that these pictures and NHTSA involvement will result in additional research, assuming you submit the case to NHTSA. If this is truly a casting issue, your actions could save a life.
Recalls | NHTSA - thanks