I was just looking at the latest diffs of this page via my watchlist, then clicked the "New section" link at top of the page, which brought up the new interface, then clicked "switch back to the legacy experience". That brought up the following:
Section editing not supported
Section editing is not supported in this page or is disabled for this view.
Return to Main Page.
I don't know what is supposed to happen, but I don't think that is it. "Return to Main Page"? Weird. – @Jonesey95
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Change 809675 had a related patch set uploaded (by Bartosz Dziewoński; author: Bartosz Dziewoński):
[mediawiki/extensions/DiscussionTools@master] New topic hint: Avoid error about section editing when opened from diff
Change 809675 merged by jenkins-bot:
[mediawiki/extensions/DiscussionTools@master] New topic hint: Avoid error about section editing when opened from diff
Change 809688 had a related patch set uploaded (by Bartosz Dziewoński; author: Bartosz Dziewoński):
[mediawiki/extensions/DiscussionTools@wmf/1.39.0-wmf.17] New topic hint: Avoid error about section editing when opened from diff
Change 809689 had a related patch set uploaded (by Bartosz Dziewoński; author: Bartosz Dziewoński):
[mediawiki/extensions/DiscussionTools@wmf/1.39.0-wmf.18] New topic hint: Avoid error about section editing when opened from diff
We're just in time for the backport window, so I thought we might backport this, even though it's not the most severe of issues.
Change 809688 merged by jenkins-bot:
[mediawiki/extensions/DiscussionTools@wmf/1.39.0-wmf.17] New topic hint: Avoid error about section editing when opened from diff
Change 809689 merged by jenkins-bot:
[mediawiki/extensions/DiscussionTools@wmf/1.39.0-wmf.18] New topic hint: Avoid error about section editing when opened from diff
Mentioned in SAL (#wikimedia-operations) [2022-06-29T21:30:09Z] <cjming@deploy1002> Synchronized php-1.39.0-wmf.17/extensions/DiscussionTools/modules/NewTopicController.js: Backport: [[gerrit:809688|New topic hint: Avoid error about section editing when opened from diff (T311665)]] (duration: 03m 35s)
Mentioned in SAL (#wikimedia-operations) [2022-06-29T21:34:07Z] <cjming@deploy1002> Synchronized php-1.39.0-wmf.18/extensions/DiscussionTools/modules/NewTopicController.js: Backport: [[gerrit:809689|New topic hint: Avoid error about section editing when opened from diff (T311665)]] (duration: 03m 43s)
New Section -> Legacy mode from diff view doesn't give confusing error message. See https://photos.app.goo.gl/NQaeSP9CgQgSnFDt6
This is now FIXED for me in legacy Vector on en.WP (the original conditions in which the bug was observed). Thanks for the quick patch!