Spring Boot Issue 25759

spring-projects/spring-boot#25759

See the issue for complete details ^^

Reproduction

1. Clone the repo and run the DemoApplicationTests.
2. Notice that an exception is generated on application startup.
3. Change the pom to use Spring Boot 2.3.9.RELEASE.
4. Run DemoApplicationTests again.
5. Notice that the test runs and that logging out put contains [[Demo Config]] --.

At this point we have demonstrated prior behavior with 2.3.9.RELEASE (configuration working w/ spring.profiles.include) AND regression with 2.4.2.