Both are up to date. I actually suspect this is an issue caused by the newer firmware, but there is only one firmware version available when I looked into it.
I ended up working around the problem, and just using the old NVME as the OS drive and using hibernate rather than sleep. It seems something about going into standby causes the problem, and the system going “cold” by parking onto the disk doesn’t cause the same issue.
Yeah, it’s been smooth going for me too. Had a few hurdles right at launch, but it’s been great since.