WITH_CREDENTIALS env variable in DOCKER doesn't work

Q&A (please complete the following information)

• OS: using your latest Docker image
• Browser: Firefox
• Version: 79.0 (64-bit)
• Method of installation: Docker
• Swagger-UI version: latest
• Swagger/OpenAPI version: OpenAPI 3.0

Content & configuration

Nothing configured. Using OOB-Docker Image

Swagger/OpenAPI definition:

# your YAML here

It's not an issue with the OpanAPI yaml

Swagger-UI configuration options:

SwaggerUI({
  // your config options here
})

Nonme. Using OOB-Docker Image

?yourQueryStringConfig

When using /?withCredentials=true#, setting cookies works. When NOT using it but relying on environemnt variable WITH_CREDENTIALS: "true" it doesn't work. Cookies not set.

Screenshots

With URL parameter:

Without, also showing the env:

How can we help?

Maybe tell me how to activate "withCredentials" so that I do not have to give it in URL.