Same for me, they were gone. Your’e lucky that yours came back. T*T Im still waiting for my list to come back, and it sucks because i couldnt get any updates and I LITERALLY CANT REMEMBER THE TITLE. Here is the link for the explanation they gave and some updates in the comments section...
https://www.mangago.me/home/mangatopic/21080691/
That information is outdated. The developers already confirmed that only comics/books that were star-rated or tagged could be recovered from the crashed server. You have to rebuild your lists. Also, since those were the only ways they could retrieve the data they couldn't put back into the appropriate list, so you'll have to go through your Already Read list and shuffle things around to the right list.
Rebuilding Your Lists:
1. Use your previous (old) notifications to add to your reading lists. (This has been tested and works to start receiving notices again.)
2. If you have any bookmarks -- re-add them to your lists.
3. Use any previous comments (topics) you've left on stories here to help your lists.
4. Use your history (clock icon) to add to your lists. (If you see nothing, click the "Show All" link. It may show something.)
5. If you have a favorite author, find a story written by them and start adding the comics listed under their name.
6. If you follow someone, look through their lists and start adding them to your lists from there.
7. If you have a favorite unofficial scan group -- use their website to add to your list. If they are defunct then use Baka Manga or another avenue to see what series, they worked on to add to your lists.
Below was created by another user to help save your lists. I use a spreadsheet, so I haven't tested this.
https://docs.google.com/document/d/14Drj0CviUhrAmZlU-DC-AtxGFQoH1_PYQ81b2Vzu82w/edit?tab=t.0#heading=h.acjitdw8v0h

is anyone still having this issue..., the only thing that came back was my "already read"