I'm currently trying to set up an automation to update the summery of a linked issue based on a custom field but can't get it to work.
I have been running a very similar automation by setting the summery from the same custom field but rather than updating an existing linked card it creates a new issue.
Also when I set the field to just a text output "testing" it works fine, and only fails when trying to update an existing linked issue from a custom field.
Automation that is failing:
Error Message:

Update works when:

Automation that is successful at setting the Summary from the custom field when running in parallel
