Some GAS automations not working as of today

[Jonathon]

I'm receiving the following error on some critical workflows:

Error encountered in step with name [my step name]: The tasks argument included a null value. (Parameter 'tasks')

Previously we could leave a variable blank. Now we have to include empty quotes ("").

[kloshar4o]

Why is this happening? Is there any updates feed with breaking changes list? This to me looks like a major bug