Well it’s there at least. Hmm. I don’t know a whole lot about windows but you can certainly get back to those boot options you saw before by pressing shift while booting, which will open the GRUB options. I’d give the windows boot manager another shot from there.
If that ends up working you can change the grub settings to wait for input instead of automatically booting pop. If that doesn’t work then something is probably wrong with windows and I would just try reinstalling since it sounds like you don’t have anything on there yet.