I had installed a bootcamp partition to try out windows 10 on my 15" 2017 MBP, and removed it. After removing it, the system boots onto the windows partition, revealing the "Windows is Broken press F1, F8, or F11 for boot options.
When this happens, if I hold down the TouchID sensor, there is a temporary workaround where I can hold the option key on boot to change it back to macOS.
How do I stop this tedious behaviour?