That reminds me of another issue in which increasing the subdivisions above 4 throws up a “target contains invalid polygons” error when I try to use Surface Deform to bind the eyelashes geometry (and that’s with a triangulate modifier already added, which would normally circumvent that sort of thing).
I believe I’ve finally reached that point where the software is pushing back harder than I can push forward, although it’s taken a lot longer to get to this point than it did last time around.
[Edit] As in, it’s taken longer to start hitting impenetrable obstacles (not longer to get the job done - that’s been faster). 