I too agree with what everyone else has been saying on this subject going back to 2020.  If you create an invoice in a Project and select the Customers name, the invoice is populated with their information.  If you then change the Customer name to the Project name, you loose all the populated information thus requiring for you to manually enter.  This is a terrible idea and a very cumbersome process.  All we need is a Project field within an invoice?  Is this being worked on?

Bob