GroupedOpenApi bean get's exception during context initialize

[Schreuderjg]

We use GroupedOpenApi to separate our endpoints in groups.

It all works nice on Java 21, Spring Boot 3, Kotlin 1.9.25. We use webmvc-ui springdoc starter 2.8.15.

Upgraded it to Spring Boot 4.01, Java 25 runtime, (kotlin version of spring boot 4, Kotlin compiles to Java 24),
springdoc webmvc-ui 3.0.1.

The error we get is: "Illegal factory instance for {bean name}".

[Schreuderjg]

If I remove the GroupedOpenApi beans from the swagger config, the application starts and runs fine.