Great Wall graphics

Small correction needed on the Great Wall graphics.
See attached screenshot where the cultural border is on an island. The Great Wall graphics is on the island, but it's protection is only on the continent.
I have seen barbarians crossing the wall on the island - sorry no screen capture of that one.
Suggest not to put the wall graphics on an island only on main continent.

A save would be useful - especially one showing the barbs crossing it.

attached, just after the barbs crossed the wall, in 2 turns they will come back to the other side

Just a question, no real answers.

What would the expected behavior be for a piece of land that you thought was an island, but was really on your mainland?
Should the wall be constructed/active, or not?

Perhaps the wall should be drawn/active ONLY around contiguous, land based cultural borders extending from the city that built it? That is, the wall would never jump water even if the other side is really on the same continent.

Fixed for the next patch.
LL Cool Jay