You say, "when I create a new project," what about opening an existing one? Same thing?
It may be something got crossed when installing one of the Python distributions. To start, I would check the registry to see what the values are for the ArcGIS Pro Python environment and make sure they are either set correctly or the files exist on the local hard drives:
C:\Users\bixb0012>reg query HKLM\Software\ESRI\ArcGISPro
HKEY_LOCAL_MACHINE\Software\ESRI\ArcGISPro
InstallDir REG_SZ C:\Program Files\ArcGIS\Pro\
....
PythonCondaEnv REG_SZ arcgispro-py3
PythonCondaRoot REG_SZ C:\Program Files\ArcGIS\Pro\bin\Python
....