The component annotation processor maps multiple input Java classes to a single generated class/resource. It uses the sourceElements parameter of Filer.createSourceFiles() to attach all those input classes to the generated class/resource.

IntelliJ used to ignore the source information, but 2020.3 Beta is now using it to delete the generated class/resource whenever one of the input classes changes. But because some of the input classes are not being compiled, the annotation processor is unable to generate the class/resource from scratch.

E.g. when any core annotated component class changes, the CoreModuleImpl class and the META-INF/services/org.infinispan.factories.impl.ModuleMetadataBuilder are removed. The annotation processor then fails with

@InfinispanModule annotation not found in any class, please perform a clean build. Found components [...]