From: Eindhoven, the Netherlands
KungPao, we indeed are addressing this for Southern Storm.
In Red Storm, the line-of-sight between those two hexes runs along the seam of the hexes in-between, and it is ambiguous how to interpret the line-of-sight, and from which intermediate hexes to take into account visibility/concealment and elevation. Most of the times the results are fine, but there can be corner cases for which the results are surprising (like the above situation).
In Southern Storm, we test using two lines-of-sight, offset left and right of the center line/seam, so we are robust and predictable in these situations.
Sadly, since the above solution requires twice the compute power, and is part of a bigger rewrite of the line-of-sight code, it is not something that we can back-port to Red Storm.
OTS "garden boy"