Dismiss unread no longer works

For roughly the last two weeks or so, when I select and unread topic to be dismissed, so that it never shows up as unread anymore, new messages to the topic continue to be flagged as unread.
At least for some topics.

Are you talking about the new dropdown menu or the notification button at the bottom of the thread?

The latter.

Have you cleared your browser cache?

No/ I’ll try that.

Clearing the cache hasn’t changed the behaviour.

Same here, clearing the browser cache didn’t t help:

  • W10 + Firefox ESR
  • TUXEDO linux + Firefox flatpak version
  • Ipad OS + Safari

Each component being up to date.

Same.

please bring it up with upstream at meta.discourse.org

we do not do anything special here in this regard

It seems to have started working again today.