Problem: I just noticed this last night, trying to resolve an issue with setting a local exception to my global preferences on Meta Wiki, but essentially, prior to the MediaWiki 1.37 upgrade, when you set your preferences to be global via Special:GlobalPreferences and went to Special:Preferences, any preferences set to be global were greyed out unless you checked the checkbox to set a local exception to the global preference. Now, though, the options are not greyed out, and when I supposedly reenabled options globally via Special:GlobalPreferences, they were not enabled on Meta Wiki despite not having any local exception set.
What should happen: In Special:GlobalPreferences, there are two checkboxes for each preference. The left-most option sets whether a preference is to be global or not; the second sets whether the given option is to be enabled or not. When the left-most option is enabled or set to true, that option should be greyed out in Special:Preferences, unless a local exception is set.