[BUG] generator name: aspnetcore - generator type server. Actions in controller not found when using swaggerUI/openapiUI

Dear development team,

following issue occured:

openapi-yml part (base url is not just server):
servers:

• url: 'https://{server}/myBase'
  variables:
  server:
  default: localhost
  description: address of the server

Generated server stub.

Action part in Controller (important is Route, seems to be correct):
[HttpPost]
[Route("/myBase/weight/hu")]
[Consumes("application/json")]
[ValidateModelState]
[SwaggerOperation("ReceiveHuWeight")]
public virtual IActionResult ReceiveHuWeight([FromBody]List huWeight)

In Startup.cs
ConfigureServices....
.AddSwaggerGen(c =>
{....
c.DocumentFilter("/rest/cpi"); // possibly not correct

Leads to http error 404, when testing api in SwaggerUI/OpenapiUI of generated server

When removing " c.DocumentFilter("/rest/cpi");" everything works fine.

yaml has been created by customer and is not changeable. That means service has to start with base URL
"https://{server}/myBase"

Would you please check it and, if possible, do a fix to generator?

Best regards
Jörg

Start with the generated Startup.cs, the BasePathFilter configuration, and the controller route shown in the issue. Reproduce the 404 through SwaggerUI/OpenapiUI with the server URL https://{server}/myBase, then trace how the /rest/cpi filter interacts with /myBase. Done means the generated server and its UI resolve the documented base URL without requiring the YAML to change.