documentaton enhancement for stubs and generics

this is a question but I feel like the documentation could be improved

  @SuppressWarnings("unchecked")
  Map<String, @Nullable Object> getContext( Map<String, String> context ) {
    var map = new HashMap<String, @Nullable Object>();
    map.putAll( context );
    map.putAll( mapper.convertValue( cliConfiguration, Map.class ) );
    map.put( "configDir", configDir.getParent() );
    return Collections.unmodifiableMap( map );
  }

  ProcessedFileConfiguration from( RawFileConfiguration config ) {
    var context = this.getContext( config.getContext() );
    var bldr = ImmutableProcessedFileConfiguration.builder();
    bldr.overwrite( config.getOverwrite() );
    bldr.context( context );

    config.getSource().ifPresent( src -> {
      bldr.source( Path.of( this.processTemplate( src, context ) ) );
    } );
    return bldr.build();
  }

is giving the errors

/home/xeno/IdeaProjects/brix/config-loader/spi/src/main/java/com/xenoterracide/brix/configloader/spi/ConfigValueProcessor.java:61: error: [assignment.type.incompatible] incompatible types in assignment.
    var context = this.getContext( config.getContext() );
                                 ^
  found   : @Initialized @NonNull Map<@Initialized @NonNull String, @Initialized @Nullable Object>
  required: @UnknownInitialization @Nullable Map<@Initialized @NonNull String, @Initialized @NonNull Object>
/home/xeno/IdeaProjects/brix/config-loader/spi/src/main/java/com/xenoterracide/brix/configloader/spi/ConfigValueProcessor.java:74: error: [assignment.type.incompatible] incompatible types in assignment.
    var map = new HashMap<String, @Nullable Object>();
              ^
  found   : @Initialized @NonNull HashMap<@Initialized @NonNull String, @Initialized @Nullable Object>
  required: @UnknownInitialization @Nullable HashMap<@Initialized @NonNull String, @Initialized @NonNull Object>
/home/xeno/IdeaProjects/brix/config-loader/spi/src/main/java/com/xenoterracide/brix/configloader/spi/ConfigValueProcessor.java:77: error: [argument.type.incompatible] incompatible argument for parameter value of put.
    map.put( "configDir", configDir.getParent() );
                                             ^
  found   : @Initialized @Nullable Path
  required: @Initialized @NonNull Object
3 errors

I've referred to https://github.com/typetools/checker-framework/issues/4070#issuecomment-751540533 but still haven't had any luck with this. I had compilation working with PolyNull but

Start with the question and its referenced Checker Framework issue 4070, then inspect ConfigValueProcessor.java at the reported lines. Determine which guidance about stubs, generics, and nullness annotations is missing or misleading. Done means a clearly scoped documentation improvement addresses the reported errors and explains the relevant constraints.