lexgen: LexBlob fields are always None, even when lexicon sets them.

I define some standard fields on my gif blobs in my lexicon as follows:

    "gif": {
      "type": "object",
      "properties": {
        "alt": {
          "type": "string"
        },
        "blob": {
          "type": "blob",
          "accept": ["image/gif"],
          "maxSize": 2000000
        }
      },
      "required": ["blob"]
    }

However when I check the types generated with jacquard-lexgen I see that all the fields are set to None:

map.insert(
    ::jacquard_common::smol_str::SmolStr::new_static("blob"),
    ::jacquard_lexicon::lexicon::LexObjectProperty::Blob(::jacquard_lexicon::lexicon::LexBlob {
        description: None,
        accept: None,
        max_size: None,
    }),
);

Ideally these would be set correctly as I intended to read these from my generated types to perform some additional validations. I'm not sure if this is user error or an issue with the generator