I have seen something similar, and the fact you’re seeing this only on meta makes me think it is related to an issue in the ActivityPub plugin. It publishes topics/posts on a schedule to ActivityPub subscribers, and in the process, it updates the post’s status. It’s possible that it is too eager to reload a topic when it does that.
There is a PR with a fix in the works: DEV: replace postStream.refresh with AP topic tracking state service by angusmcleod · Pull Request #185 · discourse/discourse-activity-pub · GitHub, will review and merge shortly.