Unexpected offset on non-square isometric tilemaps

[SineNomine2001]

If say the tilemap is taller than it is wide, then (0,0) will be at B' instead of B. The x-offset of the tilemap and Map.width seems to only change with the "width" of the iso tilemap (length running top-left to bottom-right) and not the "height" (length running top-right to bottom left).

The point C seems to be always fixed at (Map.Width/2, 0) which could be what caused this issue.