Version: jackson-dataformat-xml-2.9.9
When using FilterExceptFilter to serialize selected fields, XmlBeanSerializer also serializes the AnyGetter field. The problem seems to be at XmlBeanSerializerBase.serializeFieldsFiltered() line: 292, where it calls _anyGetterWriter.getAndSerialize().
On the other hand YAML/JSON serialization works fine because BeanSerializerBase.serializeFieldsFiltered() line: 775, calls _anyGetterWriter.getAndFilter()