The property 'caption' in type CMMedia still was of type 'string' and contains CoreMedia richt text grammar. As all other rich text properties were updated already to a new standard pattern, this was also updated for 'caption' also. Although this change is marked breaking, for most cases this change is most likely non-breaking, as this property is a non used property in Studio (blueprint-doctypes). Unless custom changes are making use of the property 'caption', this change may be considered non-breaking.

(CMS-22179)