Weird expression errors in After Effects Beta 17.1.3 (Build 18)

Steps to reproduce:
    1. Check out my sample project and screen recording here: https://www.dropbox.com/s/w3t4zq8jvua0nlw/Bug%20on%20After%20Effects%20Beta%2017.1.3%20%28Build%2018%29.zip?dl=0

Result: 

• When I open the sample project in latest Beta I see an expression error
• Sometimes turning on and off a layer or moving playhead fixes the error
• When changing the controls on "Controller" layer all sorts of weird errors happen which were not happening in previous versions

Expected:

• No expression error
• These expression errors were not happening on previous versions of After Effects 2018-2020 
• The expression errors do not make sense - for examle "Couldn't turn into numeric value" when dividing a number property by 2.

 
System info
    Application: After Effects (Beta) v17.1.3.18
    OS: macOS v10.15.5, RAM: 32.00 GB, CPUs (logical): 12

Let me know if there is anything more I can provide. 

Cheers