To observe/reproduce:
- Create a file on local using ${FileName1}. In our case, we can use https://en.wikipedia.org/wiki/File:Cleveland_Cavaliers_wordmark_logo_2017.png.
- Create a file on Commons as ${FileName2}.
- Create a redirect on Commons from ${FileName1} to ${FileName2}.
Observed behavior:
- The local has a banner stating the file is on Commons when it is not.
- The local page transcludes the text of the file page twice.
Notes:
- I'm not sure if this bug is easily reproducible or not. I have only observed it once on this page.
- Possibly related to T30299.
Screenshot: