Ren'Py 8.3.4. It's just a new project with "show eileen happy with Regicide".
Viewing post in Make Visual Novels! RenPy Shader Pack comments
Try slapping this either in a block under that, or in the Regicide transform definition.
mesh True
so it would look like this:
show eileen happy with Regicide: mesh True
If that fixes it, I'll push out an update to make it part of the default Regicide setup. I thought I had already done that, but I might've missed it.