This is a really weird bug. If you set:
On the application.properties file of any spring-boot application using actuator, then camel routes created through RouteBuilders are not loaded ("Total 0 routes, of which 0 are started.").
I've found it in (all) the fabric8 basic quickstarts, but it happens also in the "camel-example-spring-boot" bundled with Apache Camel. Everything works in 2.19.x.
Setting a different management port is a best practice.