On simplewiki, the page "Wikipedia:Requests_for_deletion/Requests/2010/ASDFGHJKL;" exists:
https://simple.wikipedia.org/wiki/?curid=233152
https://simple.wikipedia.org/w/index.php?title=Wikipedia:Requests_for_deletion/Requests/2010/ASDFGHJKL;
https://simple.wikipedia.org/w/index.php?title=Wikipedia:Requests_for_deletion/Requests/2010/ASDFGHJKL;&action=edit
However, when you try to access it using the canonical /wiki/ URL, it forwards you to the page "Wikipedia:Requests for deletion/Requests/2010/ASDFGHJKL" without a semicolon, which doesn't exist. This seems to happen regardless of what query string you use.
https://simple.wikipedia.org/wiki/Wikipedia:Requests_for_deletion/Requests/2010/ASDFGHJKL;
https://simple.wikipedia.org/wiki/Wikipedia:Requests_for_deletion/Requests/2010/ASDFGHJKL;?action=edit