Intersting thumbnail bug

So in case anyone is seeing the same, after further investigation, I think it is a bug in photos. I've found the problem goes away if I revert an edited image to original - after which it generates the thumbnail correctly.

So the workaround for me is to first edit the image (simplest possible edit, even auto enhance from the thumbnail view works) then revert to original, and after that editing that image seems to generate a thumbnail instead of a grey rectangle.

What I do after importing raw files is select them all, hit CMD-E to auto enhance them all, then revert them all back to orignal, and then they seem to work OK.

Thanks for the suggestion. I'll give that a go - but you'd think database repair would do it.

EDIT: OK - I've edited two photos, and stuck them in an album. Thumbnails are blank. Will leave on overnight.

40 minutes on and the thumbnails are still not generated. I'm guessing they won't be there by the morning either (11:40 pm here at the moment).

I've also found that the problem does not occur with jpg files, or RAW files from my other panasonic GX800 (Also RW2 extension) - only with the G80 raw files.

So it seems to be a specific bug associated with the raw files from one camera.

Thanks for the reply - No, these are freshly imported raw files, and they are to a secondary library (not my system library) so are not connected to Icloud.

Import - edit - thumbnail goes black until revert to original and second edit - then all is fine. No duplication before edit.

Only a problem with the G80 raw files, not the GX800 or jpg files.

@léonie

PS - Off topic, but I can't leave a comment there, so I'll do it here.

Thanks for your index to photos user tips. Incredibly useful resource for a relatively new photos user such as myself.