Confusing error message when trying to move thread

[XFFA.IR Bot]

Steps to reproduce

1. Create two forums of type article
2. Create a new thread in the first article forum
3. While viewing that thread as a moderator with permission to move threads, select Move thread from the More options menu
4. Activate option Leave a permanent redirect
5. Select the second forum created in step 1) as destination forum

Expected Result
The article thread is moved to the destination forum and a permanent redirect is created in the...

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