it's being fixed manually 1 list at a time. and i mean like right now they are only working on the reading currently list. or was it the read already list.... @.@ my brain hurts....anyhow. it's 1 list out of 3 being worked on for over a million people. sadly if you got skipped in the mayhem, you might have to wait until the glitch is fully fixed to report to them that yours wasn't fixed for them to go back in and get yours fixed. please keep up with things by reading the links in here https://www.mangago.me/home/mangatopic/21107997/ and the suggestions of things to do while you wait if you want.
possibly. but give it sometime. a lot of us are suggesting not do to house keeping on your lists until everything is fixed. ( when they say it's all fixed) house keeping meaning moving things to proper lists, deleting things, turning things from seen to private or private to seen. other wise some stuff might appear again, go to other lists or turn the other way from private to seen and it would only frustrate you to have to do it all over again

I thought the timestamp for 2020 and beyond is what’s left to be fixed. I’ve been using this website since 2016 why aren’t my lists not coming back slowly im worried. I can’t see the manga ive marked from 2016-2020. Should I still give it time ╥﹏╥ ARGHH