Can heroes move across a wall token, a diagonal gap between walls, or a black border?

Question

Accepted Answer

No. Spaces on opposite sides of a wall are not adjacent (including diagonal spaces created by walls), and spaces split by a black border are not adjacent unless gray borders line up. Neither heroes nor enemies can cross. Some ranged abilities can still reach a target across a wall.

The Lord of the Rings: Journeys in Middle-earth

Can heroes move across a wall token, a diagonal gap between walls, or a black border?