Issue generating an Angular endpoint / Model with multipart/form-data

Question

The following is an excempt from my OpenAPI specification that I use to generate my angular services with openapi-generator-cli:

  requestBody:
    content:
      multipart/form-data:
        schema:
          type: object
          properties:
            test:
              type: array
              items:
                type: string
                format: byte

This request body fails to generate with the following warning output in the generation process:

[main] WARN  o.o.codegen.DefaultCodegen - Could not compute datatypeWithEnum from string, null 

I originally had a more complex structure of schemas, but I narrowed it down to this part: an object with a property that is an array containing a byte array (putting the items of the array in an object has no impact). If I were to move the byte array property into the test object, it generates, but as soon as I have one or multiple arrays containing the byte array it does not work anymore.

I run the generator command through npm as a script:

"openapi-generator-cli generate -i ../../../../openapi/openapi.yaml -g typescript-angular -o src/generated-sources/openapi --additional-properties=supportsES6=true,npmVersion=6.9.0,ngVersion=14",

Previously I had the content type set to application/json and it worked fine, simply changing the content type to multipart/form-data made it not work anymore and I sadly am required to use multipart/form-data in the future.

Help or suggestions are highly appreciated

What I have tried:

• Using binary and or base64 as the format
• OpenAPI generator versions 5.1.1 and 6.4.0
• turning on verbose logging (no extra lines of warning or errors are output)
• reducing my more complex datastructure to the shown example
• read through following post: OpenAPI Example multipart form data which seems to depict a very similar datastructure but it seems to work(?)
• found OpenAPI V3 Maven Plugin generates incomplete interface code with multiple file upload using multipart/form-data which seems to describe a similar issue but with a java generator
• found and tried solution from swagger-ui - open api 3, multipart/form-data array problem (change name of property to include [] brackets) with no change in outcome