Manual:$wgEnableCascadingProtection

Access: $wgEnableCascadingProtection
Enable cascade protection.
Introduced in version:1.10.0 (r19095)
Removed in version:1.13.0
Allowed values:(boolean)
Default value:true

Details edit

Enable cascade protection. Set this to false to disable cascading protection.

Removed in 1.13, enabled unconditionally.