Fields array getting unset if just one field has a private uri_scheme

When checking to see if a file should be moved to public storage, an array of fields is being created on line 394 of HandlerService.php, the array loops through and checks each fields uri_scheme. If just one of those fields has a private uri_scheme then the whole array is being unset preventing the fields from proceeding through the method.

For example, on a current project, my when publishing a document media entity, there are two fields being set in that array. A thumbnail field and the actual file field. The thumbnail field has a private uri_scheme and the actual file field has a public uri_scheme. The thumbnail field causes the fields array to become unset so the actual file field never gets processed and the file doesn't move to the public directory as I would expect.