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
Win10 64bit Intel i7 6700 3.40 Ghz, 32 Gb RAM, GeForce RTX 3070
AC 27.0 (4001 INT FULL)