@Yaron_Koren It looks like I reopened this task by mistake. This was previously fixed in https://gerrit.wikimedia.org/r/c/mediawiki/extensions/PageForms/+/739566, but I used a slightly older Page Forms version that did not include this fix. Unfortunately this means the fix I proposed here breaks the Save button again. I have opened T298506 to revert the change. Apologies for the confusion!

I found and fixed this issue in my local Wiki installation before I found this bug report. I added my version of the fix for completeness, without having any preference regarding which one is finally adopted. As long as it is fixed in whichever way you think is best, I am happy.

Reopening, because this is still an issue for me in Firefox 91.3.0 and Chrome 96.0.4664.45 with Page Forms and VEForAll.

The workaround to set $wgGroupPermissions based on the REMOTE_ADDR is not acceptable to me for security reasons.