'drush fc' wildcard doesn't work on component type portion of the name

$ drush fc field%image%
No  sources match "field%image%"                                                          [error]
$ drush fc field_instance:%image%
 Available sources
 field_instance:file-image-field_country
 field_instance:file-image-field_file_image_alt_text

I would have expected 'field%image%' to match 'field_instance:file-image-field_country', but it doesn't. The component type, 'field_instance' appears to need to be given in full.