Lost recently added album after a rescan

[Lio84]

Hello

Exactly the same problem today as in august: all my recently added album cancelled replaced by others (not recent). Particularly painful
Same phenomena: surprinsingly long rescan after adding 4 new albums by copy/past from my laptop to the NAS.
I usually prepare the albums on my laptop with mp3Tag, then copy the albums in the appropriate folder in the NAS by wifi.

My operations were:
- Add album 1 to the NAS by copy and past from my laptop
- Add album 2 to the NAS by copy and past from my laptop
- realize that albums 1 and 2 have a possible mistake in the tags and delete album 1 and 2 in the NAS
- Correct the wrong tags in albums 1 and 2 on the laptop
- Select and add albums 1,2,3 and 4 in one shot by copy and past from my laptop
- rescan (quite long)
- All my 70 recently added albums cancelled !

I did only one rescan during the process at the end

Running MinimServer 2.1.2 update 218 on QNAP HS 251+

Is there a way to restore the recently added album ?