SOLVED: Season Dissapeared after giving sort title

[JackyHe398]

I have renamed the sorted title of one of the Season(I named it "OAD") to "Season 01.5". After I refresh metadata, the Season just dissapeared. I also renamed the sorted title of "柯里烏斯之夢"(Visions of Coleuso) to "Season 02.5", but no impact to it. 

here is the Photos and file structures.

user@truenas:/mnt/Pool1/media/anime/關於我轉生變成史萊姆這檔事$ ls
OAD  'Season 01'  'Season 02'  'Season 03'  柯里烏斯之夢
user@truenas:/mnt/Pool1/media/anime/關於我轉生變成史萊姆這檔事$ cd OAD
user@truenas:/mnt/Pool1/media/anime/關於我轉生變成史萊姆這檔事/OAD$ ls -all
total 6765712
drwxr-x---+ 4  user  user        10 Feb 27 01:19 .
drwxr-x---+ 7  user  user          7 Feb 27 02:16 ..
-rw-rw----+ 1  user  user 1323965965 Feb 26 22:04 S00E02.mkv
-rw-rw----+ 1  user  user 1451368851 Feb 26 22:04 S00E03.mkv
-rw-rw----+ 1  user  user 1376148823 Feb 26 22:04 S00E04.mkv
-rw-rw----+ 1  user  user 1367695210 Feb 26 22:04 S00E05.mkv
-rw-rw----+ 1  user  user 1408497193 Feb 26 22:04 S00E06.mkv
drwxr-x---+ 2  user  user        10 Feb 27 01:55 SPs
drwxr-x---+ 2  user  user        13 Feb 27 01:55 Subtitle
-rw-rw----+ 1  user  user        69 Feb 26 22:11 fansub.txt
Another weird points is, when i named both of them to  '"Season 01.5"' and  '"Season 02.5"' (with double quote), it correctly goes to the very beginning of the season table. After i remove the double quote, the problems appear. Is it possible for me to rename the sort title from command line to bring it back?

[theguymadmax]

Try renaming the folder OAD to Season 00 on your filesystem then check if the issue still persists when you change the sort title in Jellyfin.

The episodes of Visions of Coleus should be placed in that Season 00 folder and should be named according to your source:
S00E11.mkv
S00E12.mkv
S00E13.mkv

[JackyHe398]

Indeed, it will appear after renaming. Thank you