Bug Description

If you use ?? instead of or inside a form:create tag, the errors are incorrect.

It might not have anything to do with the form:create tag at all, but that's just where we noticed it.

Ref #3669

How to Reproduce

1. Create a form named contact
2. Add a required field to the blueprint, just so there's an easy way to cause a validation error.
3. Use this template to output the form:

   {{ form:create in="{foo ?? 'contact'}" }}
     {{ errors | dump }}
     {{ errors | ul }}
     <button>submit</button>
   {{ /form:create }}
   

4. See that errors is a ViewErrorBag, and that it's not output as a list.
5. Change ?? to or
6. See that errors is an array, and they're output correctly.

Environment

Statamic version: 3.1.22