Type definition for root query type 'Query' not found!

[hilbertglm]

I am am getting the following error after moving from v11 to v12:

graphql.kickstart.tools.SchemaClassScannerError: Type definition for root query type 'Query' not found!

A stop in the debugger shows that it found the resolver class, but there was no TypeDefinition populated, which caused the error. I tried to download the source code to get a better idea of what is going on, but the source code in the Maven repository doesn't match the compiled binaries.

I have moved another project to v12 and got it working, but I can't figure out what is going on here. Any help would be appreciated.