Bug - Malian wall, missing graphics resource?

I was building a wall between a large mountain pass with the Malians and got a weird yellow connector block as the connection between the keystone and the impassable mountain terrain. The weird block had text on the top reading “MISSING - for more information look in game log files”

I checked warnings.log and didn’t see anything that seemed to be relevant. I can certainly attach it if desired though.

Thank you for reporting @kiloByte2! This is one we’re aware of and working on.