As of about 20 minutes ago, it seems several job types are no longer being processed.
I observed this mainly through the Watchlist feature on Wikipedia no longer working correctly. Specifically, marking changes as seen no longer works. "Last seen marker" keeps flip-flopping between the first and second read item but never progressing or persisting. This is a side-effect from the ActivityUpdateJob not executing. The marker has a single-state object cache to at least remember 1 item but that gets lost and overwritten quite quickly.