File "src/sage/rings/function_field/drinfeld_modules/morphism.py", line 543, in sage.rings.function_field.drinfeld_modules.morphism.?.__invert__
Failed example:
    f = phi.hom(K.random_element())  # known bug: macos (sporadic ValueError: the input does not define an isogeny)
Exception raised:
    Traceback (most recent call last):
      File "/home/runner/work/sage/sage/src/sage/doctest/forker.py", line 712, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/home/runner/work/sage/sage/src/sage/doctest/forker.py", line 1147, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.rings.function_field.drinfeld_modules.morphism.?.__invert__[5]>", line 1, in <module>
        f = phi.hom(K.random_element())  # known bug: macos (sporadic ValueError: the input does not define an isogeny)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/runner/work/sage/sage/src/sage/rings/function_field/drinfeld_modules/drinfeld_module.py", line 2024, in hom
        codomain = self.velu(x)
                   ^^^^^^^^^^^^
      File "/home/runner/work/sage/sage/src/sage/rings/function_field/drinfeld_modules/drinfeld_module.py", line 1930, in velu
        raise e
    ValueError: the input does not define an isogeny