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by iam-TJ 664 days ago
From the people reporting this affecting their Linux boots in various IRC/Matrix forums and my diagnostics with them, very often they weren't dual-booting in the Microsoft sense, in that they were booting using the UEFI Removable Media Path so there was no entry in the motherboard firmware's Boot menu.

I suspect the MS installer simply scans the EFI BootXXXX entries and looks for a non-Windows boot-loader path like, for example, /EFI/$distro/shimx64.efi

If one-such doesn't exist the installer likely assumes it is not a dual-boot system.