defaultValue on a select (enum) prop doesn't work

Builder content link

What are you trying to accomplish
have an option pre selected when i add my Input custom component in the prop.

what i get is an empty option selected.

in the registerComponent function i specified a default value but it does nothing when the prop is an enum

Code stack you are integrating Builder with

Reproducible code example

          name: 'validationRuleName',
          friendlyName: 'Validation Rule',
          type: 'string',
          defaultValue: 'string',
          enum: [...Object.keys(validationRules)],