I cannot mark notifications as read. Every time I click on the bell it is showing thousands of unread notifications (with "Only show unread" ticked).
Clicking "Mark all as read" (which has behind 3 dots menu, used to just be a link) makes the notifications disappear, but clicking the bell shows they're all there again, still unread.
Individually clicking mark as read on each notification makes them disappear, but then if I click the bell, they're all there again, showing as unread.
This is happening in every browser, even after logging out and logging in, clearing all caches, cookies, session and local storage.