Map stash tab doesnt work

I started playing again after patch 3.5 and noticed that now new cards are dropping (from betrayal), so I exchanged old cards for new ones (which were possible), deleted the rest. After that, I changed the type of cards in the tab with cards to "betrayal", but I could not put new maps there. By the way, besides, I still have unreleased tabs with maps from past leagues, which for some reason are not removed after they are completely cleared from the cards.
(perma-hc btw)

Map stash is currently bugged.

We are also finishing work on fixes for the existing Map Stash Tab issues. We are currently testing them and are keen to release them as soon as possible. Thank you for your patience.

source: https://www.pathofexile.com/forum/view-thread/2265554