Yea, I ran into this issue a while back when I dual booted Windows for something I don’t remember. I was blissfully ignorant when installing Windows on my system that had been running Linux for a while, got a separate SSD for it and everything. So I selected the empty SSD figuring everything Windows will be installed on it only to discover a month later that after formatting an HDD that I use for media storage that the Windows boot loader is gone…
Manually installing the Windows boot loader is not fun.