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I was on 10.2, upgraded to 10.3 yesterday, downgraded to 2021.36.5.1 yesterday, and now just installed 2021.36.5.3 which also says that it is FSD Beta 10.3.1, so all "should" be good - I'll need to do a drive to confirm.
This was my experience too, in addition to the most terrifying automatic emergency braking event at 50mph that I could ever imagine - with no obstacles as far as the eye can see. I disabled FSD and all automated assist and warnings I could and driving was better. I then updated to 2021.36.5.1...
Same here. First drive had no issues and now no autostear is available and getting forward collision warnings anytime someone is in front of me. It has to be a bug with 10.3.
In my 2020 Model Y, my Safety Score was 99 until I got up to 100 with a total of 608 miles on Friday, October 8th at 10:07 PM EST. I did not get the download. The Friday afternoon cutoff is plausible.