Heh, it landed less than an hour ago.
If the error persists, you'll probably want to do a clean build, by removing at the very least _build/stage1, even though I'd say it can't hurt to remove _build altogether. Along with that patch, I also brought back the Windows CI job and the error did not show up there, so I'm pretty confident you will not run into it again with a fresh, clean build.
Do feel free to contact me or open a ticket if somehow the error still shows up, even against a clean tree.