It updates slowly not instantly and based on the date it was marked, right now anything marked before July 2021 will be added to your list.
Check out this faq
https://www.mangago.me/home/mangatopic/21080691/
and this one to keep up with the timestamp
https://www.mangago.me/home/mangatopic/21092806/
also once they're back, in case you're looking for ways to save them perhaps in an excel file, I've made a tutorial on how to do it easily and quickly rather than having to enter everything manually one by one, so if you'd like, you can check it out.
https://docs.google.com/document/d/14Drj0CviUhrAmZlU-DC-AtxGFQoH1_PYQ81b2Vzu82w/edit?tab=t.0
Oh thank you for info.
Does all your already read and bookmark stories restored completely? I got mine but only 190 since yesterday. Then when I browsed some of the story that I know for sure I already read and bookmark before. They were not tag as I saved so and I have to bookmark again. Pretty sure my reading list is more than 1000+. I haven't received any notification for my tag stories for updates because some were I have to tag as read and bookmark again. Just asking if you also experienced it.