[Musicxml Export] - Incorrect hairpin ending placement

Since I'm not able to create a short example due to the accessibility issue 336991, I have to include this example as a whole. At bar 5, the end of hairpin in voice 2, when exporting into Musicxml, should be placed at the end of voice 2. But the current export puts it at the end of voice 1 before the backup. It's important to place every direction object at its correct voice order, otherwise our braille music translation software will be heavily confused.