[perisiana]

In the last couple of days i experienced a weird bug.

I'm checking my old books and i want to refresh the metadata with the new informations disponible online, but when i do so, the moment i click ok on the metadata window i get an error saying isn't possible to change the position on the disk for this book and if is open in another program (is not, also the folder isn't in any cloud folder).
Then all the files of the book are deleted except for the folder and the cover.

If i don't change the metadata i can open the books, sending them to my ereader etc as usual so i don't think they are corrupted?
If i copy the book in the library and work on the new copy, everything is fine as usual.

The files aren't really old cause i copied my library one year ago cause i changed my pc, but the books are in calibre since 2014 or more.
With the newest files i don't get this error.

Idk if this can be important but in the last week i download the kfx plugins and i'm converting all my books in kfx plus I'm adding word dumb x ray to them.

Are all my old books somewhat corrupted or is a calibre bug?