The map it was discovered on (of mine) was The Road to Devastation
Spring:
http://steamcommunity.com/sharedfiles/filedetails/?id=208064464
Winter:
http://steamcommunity.com/sharedfiles/filedetails/?id=258187000
After plenty of testing, I actually made a new map to test if it was my map specifically...
I put 2 players, with starting locations, starting territory, and entry points, and then a single territory point in the middle. I calculated territory, and used what it came up with. I then painted Impass layer completely blocking off both teams base, and saved/export. Vehicles were able to pass through, infantry was not, and the pathfinding indicator (the dotted trail) reflected it too. Vehicles path would ignore the impass, and infantry would stop at the impass. I can upload this map as well, but the above linked maps are how I discovered the bug (steam player Glitch-0 reported it on my map page). The Road to Devastation is designed around detouring vehicles access to the front, while granted freedom to infantry.
Thank you so much for taking the time to investigate, I hope this clears up some questions.