Steps to replicate the issue (include links if applicable):

• go to https://www.wikifunctions.org/wiki/Z13726?action=history&uselang=en
• right now, the last edit is one I made, adding a Croatian label (i.e. https://www.wikifunctions.org/wiki/Z13726?uselang=en&diff=prev&oldid=114394 )
• there is an undo link next to it taking me to https://www.wikifunctions.org/wiki/Z13726?action=edit&uselang=en&undoafter=114336&undo=114394
• I go to the bottom of the page and click "Publish"

What happens?:
It takes me back to the view, but the undo was not performed.

What should have happened instead?:
The undo should have been done.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):