We now generate more of the meta files in the META-INF/services folder. But the JARs from 2.x vs 3.0 is not exactly the same.
The component.properties dataformat.properties language.properties files is currently not being generated.
Some of our tooling depends on that these files are there.
For example the camel-catalog is not correct, try to compare its 2.x JAR vs 3.0 JAR, and you can then find out much more what is wrong currently with the 3.0 branch.