There have been many questions in the past about whether the Twitter bot should be tweeting Meta posts at all. The most recent one that I could find is tagged status-completed for no longer tweeting Meta posts, but all the tweets that I have listed above are very recent—tweeted long after the [status-completed] tag was applied.
Is this a bug? If it is, can it be fixed? I don't know whether it is only Music's Twitter account that is tweeting Meta posts. I am not aware of any simple way to search for other examples, I just happened to stumble across this situation.
For what it's worth, while removing the code that made it all go, I did find out that we were intentionally tweeting meta questions ~25% of the time so long as they were no more than 30 days old and met a handful of other criteria depending on whether they were discussion posts or had one of the other required tags. The idea was to pick out questions that were of likely interest to that site's community, and the bug report mentioned in this question had to do with meta sites tweeting questions as if they were a main site rather than following those criteria.