Real Atlassian solutions to real problems — no fluff, no SEO spam.
A rule reads a dropdown answer off a Jira form, runs clean, logs no error, and leaves the field empty. Two things are wrong and both are in the rule rather than the log. Here is the mechanism, the full field-type mapping, and the check that decides whether any of it applies to you: there are two unrelated features called Forms and only one of them automation can see.