Fix(fields): rely on input first

[stonebuzz]

Checklist before requesting a review

Please delete options that are not relevant.

• I have performed a self-review of my code.
• I have added tests (when available) that prove my fix is effective or that my feature works.
• I have updated the CHANGELOG with a short functional description of the fix or new feature.
• This change requires a documentation update.

Description

Unable to update fields from Formcreator plugin (which add c_id to input)

So rely on input first (see with Formcreator plugin)

Screenshots (if appropriate):