All podcast episodes unmarked as played

I’ve been listening to a podcast, which I started listening to on another app but then a year ago switched to Deezer. now all the episodes I have listened to on Deezer and got marked played from that and the ones I manually marked as played have lost that tag, so now I have to manually sort through hundreds of podcasts to mark them played again and check if I already have listened to them.

Anyone gotten a similar thing happen and is there a way to fix it?

It takes an annoyingly long time to manually check all episodes to see which one I should play next.