Patched Sur v0.1.0 wanted to turn off AMFI to allow it to inject code into startosinstall to skip the compatibility check. It turns out, this can actually cause some problems. You become unable to grant new permissions (like Camera and Microphone) to apps. After a little bit of research, I discovered that you can disable Library Validation which also allows Patched Sur to inject code, without running into the same problems with disabling AMFI. You only need to care about this if you see a popup in the pre-install app, but it's not something to worry about, Patched Sur can help.