pyside6-lupdate ignores r-strings

When QObject.tr is applied to an r-string, pyside6-lupdate doesn't list it in the TS file.

That's an MWE:

from PySide6.QtCore import QObject

class Spam(QObject):
    def spam(self) -> None:
        self.tr(r'\escaped from translation!')

The result of pyside6-lupdate ....py -ts ....ts is Found 0 source text(s), despite there is definitely one.