The GUI does not support adding redirects to a target without a pattern in the target. The code appears to be able to handle this, but such a redirect must now be added by the API instead of the GUI.
If tried it currently displays the message:
The regex redirect redirect must contain a named capture (value between <> brackets).
Active
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.