Preserve HubSpot merge field mapping when copying fields between templates
When a user copies a field with a configured HubSpot merge field mapping from one template to another, the merge field configuration is lost. The field itself transfers, but the merge field data source and property mapping must be manually reconfigured in the new template.
This requires users to re-do field setup work when reusing fields across templates, especially problematic for teams that standardize field configurations across multiple templates (e.g., copying a "Deal Amount" field mapped to HubSpot's amount property).
Expected: Merge field mapping should persist when the field is copied to a new template, just as other field properties (validation, required/optional, formatting) do.
Related to HubSpot CRM integration.