Thank you for your reply Scott!
You are right. I shouldn't, but...
Just trying to find a dev machine to install ArcGIS Pro 3.0.3, without breaking something.
ArcGIS Pro 2.9.5 and 2.9.6 crash when using .odc connections, 2.9.4 crashes when using symbology.
Can't upgrade my machine because I can't save projects back to 2.x and other breaking functionality.
Can't upgrade the other dev server because a lot of python scripts are being tested there.
Just looking for a workaround that won't create more issues.