A user, vincentp, reports encountering a 422 error when attempting to move posts in a self-hosted Discourse instance (v3.6.0.beta1-dev). The error occurs when selecting multiple posts via “Select+Below” or individually, targeting the last few off-topic posts in a 22-post thread. No relevant logs appear in /logsvincentp, and the issue seems isolated to this specific topic vincentp. sam asks for more context — whether the issue is topic-specific or reproducible elsewhere — and Moin suggests checking the browser’s Network tab for detailed error responses, referencing a past similar case where this helped identify the root cause.
In case you still have that problem or it happens again, it could help to check the network tab. I was able to find the error there when I had a similar error in the browser console: