ZOCs yet again

[Zardoz02]

The first game outcome that has really flummoxed me.
See the attached screenshots. A cavalry unit appears to have charged into the primary ZOC of the medium foot unit but attacked the bow unit next to it! Can that be right?

Before:

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After:

before.jpg (293.87 KiB) Viewed 703 times

[rbodleyscott]

The square is in the primary ZOC of the bows too, making them a legitimate charge target.