Comment by heavyset_go

This was my experience as of two weeks ago using a pyenv-compiled Python 3.12.4 and the latest PyInstaller on a fresh install of Windows 11.

If you used the Microsoft-signed or Python Software Foundation-signed Python binaries, maybe it doesn't trip the Defender alarm, same thing if you used older versions of Python or PyInstaller. 3.12.4 only came out on the 6th.