Unable to use token introspection endpoint for oauth2

For our USS and OpenVSX APIs, we use the token introspection endpoint in order to extract the user associated with a request from an access token. When attempting to call it now, there is an error that occurs where the request crashes with a max redirect amount hit. The page was redirect looping from attempting to login until the request crashed. This is blocking me from moving off of the Quarkus 3.8.x release, which is reaching EOL by next week.

Endpoint: https://git.drupalcode.org/project/oauth2_server/-/blob/2.1.x/oauth2_server.routing.yml#L16
Code called: https://git.drupalcode.org/project/oauth2_server/-/blob/2.1.x/src/Controller/OAuth2Controller.php#L271