Seems too obvious to be an unfixed Sonoma Preview problem but I can't see how it is an OCLP problem either.
Mount an external drive with 3 partitions on it, use Preview to view files which are then closed. I can't unmount one of the partitions, no error message, one time the driver icon vanished, other times it just stays there.
Using lsof on the command line (sudo lsof /Volumes/MyVolume) shows a list of files kept open by Preview (the files were not open or visible). Closing and reopening Preview allows my drive to be cleanly unmounted.
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