I had the opposite once, years ago: I don’t know the cause anymore, but somehow Windows disappeared from my grub.
By the time I had finally secured all my data with the intent to make that absence permanent, it did reappear (again, no idea why), but I was committed. Steamrolled the entire drive with a new Ubuntu install and haven’t used Windows privately since.
I did need to use tools that don’t run on Linux (even with wine - believe me, I tried) for uni and used a windows VM, my work laptop is Windows because I need the same tools and get no say in it anyway, but haven’t had a direct Windows install on my system since 2022.
My private OS of choice is by now Nobara, though I also intend to use an obsolete SSD to try more distros with.