page_restrictions_edit empty in AbuseFilter when page protection is inherited from a cascade
Just what it says on the tin. When an edit is made to a protected page, the AbuseFilter can normally hook on it with the 'page_restrictions_edit' variable. However, when the protection is inherited from 'cascading protection' it is not populated, preventing filter matches.
Example filter: https://en.wikipedia.org/wiki/Special:AbuseFilter/942
Example edit: https://en.wikipedia.org/wiki/Special:AbuseFilter/examine/1131845088
Identified by Espresso_Addict@enwiki