I'm working on an exterior design of a building and using the Split Face and Paint tools. I have two exterior wall elements: one from the ground plane to the roof level (I will call this the "main wall"), then another wall above it which is a three-foot-tall parapet. The two walls are contacting each other and before I started splitting faces and painting, I joined the two walls. The problem arose after using the Split Face tool: when I finished the Split Face sketch of the main wall, the parapet wall's connection seam to the main wall became visible. (The painted material is is the same on the exterior face of both walls, and they are both aligned at the exterior face.) At first I thought the walls unjoined, but when I used the Join tool again it wouldn't let me select the second wall, showing that the two walls are indeed still joined. If I drag the parapet wall then trim and extend it, the seam remains; if I cut the parapet wall and paste-to-same-place, the seam remains; if I delete the parapet wall, draw a new parapet wall in the same location, then use the Join tool to connect the new parapet wall to the main wall, the seam remains. Has anyone come across this before and figured out what is going on?
I recently thought about making a Stacked Wall with the parapet on top, so I will likely take this route since it will surely get rid of the seam; however, I am still curious if anyone has some insight regarding why this seam will not turn invisible.
I also have a hunch it has to do with the walls' join order because I removed the paint and split faces, then cycled through some wall joins, and the initial wall join would make the seam invisible but later join orders made the seam visible. Also, the seam was invisible (after splitting the main wall's face) until I joined a perpendicular parapet wall to the main wall so I would make a smaller seam invisible; however, this join made the main seam visible again.
