Enum is not being generated from JSON Schema from URL

[coldenol]

Describe the bug
A clear and concise description of what the bug is.

I'm trying to generate models from the skyscanner public JSON schema from here: partnerportal.skyscanner.net
where they have enums like this one:

But instead of enum an empty base class is being created:

To Reproduce

Example schema:
partnerportal.skyscanner.net

Used commandline:

$ datamodel-codegen --url https://partnerportal.skyscanner.net/tr-docs/static/push.schema.flights.v6.json --input-file-type jsonschema --use-subclass-enum --field-include-all-keys --output model.py
$ datamodel-codegen --url https://partnerportal.skyscanner.net/tr-docs/static/push.schema.flights.v6.json --input-file-type jsonschema --output model.py

Expected behavior
A clear and concise description of what you expected to happen.

The expected is the correct enum class like this:

Version:

• OS: MacOS Sonoma 14.4.1
• Python version: 3.12
• datamodel-code-generator version: 0.25.6

[coldenol]

Seems the following issue is about the same topic #1925