Problematic migration from fig to Amazon Q

[alpineyahoo]

I've been using Amazon Q since it was fig. I installed fig with brew install fig in the past, and one day fig suddenly changed itself to Amazon Q. I've been unaware of the problem until today since then, but I've noticed that brew info fig says that fig is installed even now. brew info amazon-q suggested it was not installed, brew uninstall fig failed, and brew install amazon-q also failed. How can one solve this situation?

[alpineyahoo]

$ q diagnostic | grep install-method
install-method = "unknown"

On my Mac install-method is unknown...