Available authorizations popup is empty for referenced security scheme

Q&A (please complete the following information)

• OS: [Windows [10]
• Browser: [Chrome, Firefox]
• Version: [latest]
• Method of installation: [Docker]
• Swagger-UI version: [latest]
• Swagger/OpenAPI version: [OpenAPI 3.0]

Content & configuration

The example can be found at:
https://github.com/jakubmalek/swagger-ui-security-ref-example

Describe the bug you're encountering

• The "Available authorizations" popup is empty.
• No errors in the console

To reproduce...

1. git clone https://github.com/jakubmalek/swagger-ui-security-ref-example.git
2. docker build -t jakubmalek/swagger-ui-example:latest .
3. docker run -p 8080:8080 --name swagger-ui-example -d -it jakubmalek/swagger-ui-example:latest
4. Open http://localhost:8080 in the browser
5. Click on "Authorize" button

Expected behavior

Authorization popup with form to be shown.

Screenshots

Additional context or thoughts

When security schema is embedded in the API specification it's working.

Clone and run the referenced swagger-ui-security-ref-example with Docker, then open the Authorize popup and compare it with a specification where the security scheme is embedded. Trace how Swagger UI resolves referenced security schemes and verify that the popup displays the expected authorization form without console errors.