Diagonal Tunnel Tileset errors

[HousePet]

A few tilesets such as the ones used for Ardhungol and the first level of the Temporal Rift are displaying incorrectly when there are diagonally adjacent empty tiles in a field of wall.

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For example will display three unconnected chambers despite it being walkable.

[HousePet]

Example showing misleading apparently unconnected tunnels that are walkable. (to the left of the character)