It's so hard to tell if my recent event was caused by the update, but I've never seen it before. This morning, when I did my last 24 hour Time Machine check (I use TheTimeMachineMechanic), I found that my the backups were all not completing. I have three SSD destinations. I also could not browse them. After rebooting all was good. BTW, I did reboot yesterday morning.
Yeah, this is definitely new. This morning I discovered the backups all ran, but something changed about each volume to make the OS think they were new disks - a few times for each of the disks. I noticed a symptom of this yesterday when I was prompted to enter the encryption password for one disk, even though it was saved in my keychain. I suspect that if I had been looking at the screen when the changes happened, I would have seen the usual popup complaining about the disks being ejected.
I'm using the word "disk" when I should be saying "volume" since I have three volumes on each of the three disks.
TheTimeMachineMechanic shows a free space report at the top:
✅ /Volumes/TMSan4 = 1.36 TB
✅ /Volumes/TMSan4 = 1.36 TB
✅ /Volumes/TMSan5 = 1.5 TB
✅ /Volumes/TMSan5 = 1.5 TB
✅ /Volumes/TMSan5 = 1.5 TB
✅ /Volumes/TMSan = 357.35 GB
✅ /Volumes/TMSan = 357.35 GB
✅ /Volumes/TMSan = 357.35 GB
✅ /Volumes/TMSan5 = 1.5 TB
✅ /Volumes/TMSan4 = 1.36 TB
✅ /Volumes/TMSan = 357.35 GB
Before the patch I never saw more than one line per volume.
I might definitely call AppleCare. I don't put much stock in writing feedback on their website.
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P.S. Carbon Copy does backups to these disks. I have the backups set to "Use strict volume identification for the destination". It didn't have any problems for each nightly backup since the patch. I'm going to study the logs some to see if I can see what changed on the volumes.