I'm getting the error 'Field "Student" cannot accept the provided value: Cannot modify a computed field.'. The field "Student" ISN'T a computed field, though; it's a linked record field.
What confuses me the most is that when I tested this automation it worked flawlessly, both in 'generate a preview' and 'run as configured' tests. It's only in live runs that it fails.
Does anybody have any clues as to what's going on?