cfn validate fails with ValueError: Expected prefix '', but was 'properties'

[iuliana]

The issue seems related to: #581

I am running cfn validate on a JSON schema and I am getting the following:

❯ cfn validate
=== Unhandled exception ===
Please report this issue to the team.
Issue tracker: github.com/aws-cloudformation/cloudformation-cli/issues
Please include the log file 'rpdk.log'

Log attached.
rpdk.log

The exact snippet is the following:

"list": {
      "handlerSchema": {
        "properties": {
          "ProductId": {
            "$ref": "#properties/ProductId"
          }
        },
        "required": [
          "ProductId"
        ]
      },
      "permissions": [
        "servicecatalog:ListPortfoliosForProduct"
      ]
    },

I also tried "$ref": "resource-schema.json#properties/ProductId" , tried removing the requiredelement, but I don't know what else to try here. I've seen other examples with similar schemas work, I have no idea what is so special about this one.
I attached the schema too.
aws-servicecatalog-portfolioproductassociation.json

[iuliana]

Nevermind ... just noticed the missing /after #.