WithHaving no global preference set for "Notify me about these events" at [[ https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-echo | Special:Preferences#mw-prefsection-echo ]], but having previously had aSpecial:Preferences#mw-prefsection-echo, but having previously had a [[ https://en.wikipedia.org/wiki/Special:GlobalPreferences#mw-prefsection-echo | global preference for those settings ]]: If I change [[ https://en.wikipedia.org/wiki/Special:GlobalPreferences#mw-prefsection-echo | global preference for those settings ]]: If I change settings of the checkboxes for notification typesPreferences#mw-prefsection-echo | settings of checkboxes for notification types in the local preference ]], and then click "Save", the checkboxes are reset to the settings of the latest global preference.
I tried a few wikis and this happens on all of them.
Workaround: Set the global preference, and optionally set local exceptions.