Holy war (and similar) distance check is kind of weird

[Silversweeper]

Consistent with vanilla CK2, but the "Neighbour of within two sea zones" check that is used in a few places (holy wars being one) checks if any county in the duchy is within one/two sea zones, not just the defender's counties. This can result in some possibly undesirable things, e.g. the Fatimids bypassing their Nubian/Ethiopian tributaries to attack someone with an inland county in a duchy because they are close enough to a coastal county held by a third party realm in the same duchy.

As a fix, I would suggest putting the "location" part of the check in an AND together with holder_scope = { OR = { character = FROM is_vassal_or_below_of = FROM } }; it's a change to vanilla, but probably how it's intended to work, and it'd mean fewer crimes against bordergore.