Yes, this was always an issue, but Hope Springs Eternal.
The real problem is that the window head in section is still going to need a patch or something.
I suppose you could insert a complex profile lintel beam with the plaster return, which would get the section detail closer to how it needs to look, but keeping the windows and their lintel beams coordinated throughout the project is going to be a pain. I suspect a 2d patch slapped on at the end is still going to be a simpler and faster solution for now.
David Collins
Win11 64bit Intel i9 3.40 Ghz, 64 Gb RAM, GeForce RTX 5080
AC 29.0 (3100 INT FULL)