Projects saved in Ae Beta are not opening in previous versions of Ae

Steps to reproduce:
    1. Create Project in Ae Beta

    2. Save Project

    3. Open Project in Ae 21 or 22 

Result: Project wont open error  and 33 : 5

(In my original project I get the above error in addition to 26 : 00)  (screenshots attached)

Expected: It should open without issue

System info
    Application: After Effects (Beta) v22.4.0.32
    OS: macOS v12.3.1, RAM: 32.00 GB GB, CPUs (logical): 8

This was happening on my other computer (PC), and for my client as well. I think this is a recent issue and I have previously been able to open projects in previous versions of Ae when using Beta, if I recall correctly.

I have tried every method of exporting and importing that I can think of, and I haven't got anything to work. I originally thought that it was a problem with some footage I was using, but it is now happening for me with a fresh project (new project with an empty comp, attached).