Referencing not working suddenly

Hi I have a plugin that prior to thursday last week worked fine.
I have implemented four different custom languiages in my plugin.
.feature-model
.feature-to-file
.feature-to-folder
.feature-to-code (only used in injected context in code comments)

the feature-model holds the definitions of the psielement. All bnfs have this:

mixin=“se.isselab.HAnS.referencing.impl.FeatureAnnotationNamedElementImpl”
implements=“se.isselab.HAnS.referencing.FeatureAnnotationNamedElement”

and the reference contributor looks like this:

public class FeatureReferenceContributor extends PsiReferenceContributor {

private final PsiReferenceProvider psiReferenceProvider = new PsiReferenceProvider() {
@Override
public PsiReference @NotNull getReferencesByElement(@NotNull PsiElement element,
@NotNull ProcessingContext context) {
var featureReference = new FeatureReference(element, element.getTextRange().shiftLeft(element.getTextOffset()));
return new PsiReference{featureReference};
}
};

@Override
public void registerReferenceProviders(@NotNull PsiReferenceRegistrar registrar) {
    registrar.registerReferenceProvider(PlatformPatterns.psiElement(FolderAnnotationLpq.class),psiReferenceProvider);
    registrar.registerReferenceProvider(PlatformPatterns.psiElement(FileAnnotationLpq.class),psiReferenceProvider);
    registrar.registerReferenceProvider(PlatformPatterns.psiElement(CodeAnnotationLpq.class),psiReferenceProvider);
}

}

in the plugin.xml:

<psi.referenceContributor implementation=“se.isselab.HAnS.referencing.FeatureReferenceContributor” language=“”/>

For some reason finding the usages of the codeAnnotations still work but finding usages of the file and folder annotations does no longer work. I have tried to debug and the contributor is running but I don’t understand why the references do not work properly.

Source code: isselab/HAnS: HAnS - Helping Annotate Software
please help!

I cleaned the build and recompiled and that seems to have worked