Hi Neil
You said
Now, there is a separate issue where Premiere doesn't remember it already has preview files and such, and recreates those every launch of the project. THAT ... is very annoying, but again, not the same issue as the above.
Well I have reported many times to the Dev Team about ProRes preview files getting lost
I don't think Premiere Pro creates all new Preview files every time, but I do know it randomly can't find some perfectly good ProRes Preview files that are sitting in the Video Previews folder.
I've only got modest size projects and it still does take a while to 're-link' data even on NVMe internal drives. I can see the logic in needing to do that - but not to 'lose' previews that were previously generated - even with no project changes at all after shutdown.
The ProRes lost Previews issue has happened on the last three PC's I have built with nothing wrong with the hardware. I still believe there is random Database file corruption in Premiere Pro, but so far Support and the dev team deny any problem.
Other users have reported the same. I still get the problem occasionally.
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