Ok, I thought I’d solved the problem of getting my most recent Mastodon posts onto my sidebar, but maybe not? They are there, but they don’t seem to be updating. I’ve verified that the RSS feed is updating (by way of a feed reader), but no joy over here at the blog. I’m not in a mood to deal with it at the moment. I’ll ignore it for now and check back later. Maybe it takes longer than two hours for a new post to appear there (which is insane, but whatever).
Addendum (20 min later): I didn’t ignore it, because it’s not possible for me to ignore a problem that needs solving. Anyway, problem solved. By default, WordPress caches RSS feeds for 12 hours. Added a line to the function file to shorten that stupidly long wait. Seems to be working.