Create a path to make it possible to migrate existing fields to be style fields
With the release of the style field functionality existing modules which may have been using content fields as styling fields currently do not have a path to migrate to the new style fields because existing saved data will not map to new fields within a separate field group (the Styles group).
Please upvote this issue if you feel this is a necessary update for your team. This will affect the prioritization by the team working on the style fields functionality.
To be clear - existing themes and modules CAN ADD style fields. The issue is specifically that there is currently no migration path for data saved to content fields in pages, to be mapped to a style field instead.
Because of this we strongly advise marketplace providers to not replace existing fields in modules with style fields, but to only add new style fields or create a new listing for your asset. This will prevent your changes from being breaking for existing users.