Null collection fields always unmarshalled as empty collection implementation

public class SomePojo {

   @ProtoField(number = 1, collectionImplementation = ArrayList.class)
   final List<String> stringList;

   @ProtoFactory
   public SomePojo(List<String> stringList) {
      this.stringList = stringList;
   }
}

      java.util.ArrayList __c$1 = new java.util.ArrayList();
      boolean done = false;
      while (!done) {
         final int tag = $2.readTag();
         switch (tag) {
            case 0:
               done = true;
               break;
            case 10: {
               java.lang.String __v$1 = $2.readString();
               __c$1.add(__v$1);
               break;
            }
            default: {
               if (!$2.skipField(tag)) done = true;
            }
         }
      }
      
      return new org.infinispan.query.dsl.embedded.testdomain.hsearch.SomePojo(__c$1);