Working on an interior remodel project, and at locations where two walls intersect and only one is being demolished, we are wanting the remaining wall to show where known patching is going to have to occur. Revit does something similar automatically with door/window infills, but seems to just ignore these wall join conditions.
Existing conditions:

Previous + Demo:

What Revit shows for "Show Previous + New":

What we'd like it to show instead (accomplished here with a detail line, which obviously isn't ideal):

Is there a way to automatically accomplish this, or are we stuck manually adding linework or a thin new wall for the patched finish?