subtests not itemized in Junit XML

Testing with tip-of-main to try out new subtests integration. Simple subtest example

def test_subtests(subtests):
    """Simple subtest example"""
    for i in range(2):
        with subtests.test(msg="is_even", i=i):
            assert i % 2 == 0, f"{i} is odd"

I expect each subtest to appear as a in a generated JUnit XML. Instead, only the top level is:

<testcase classname="samples.test_sample" name="test_subtests" time="0.006">
<failure message="AssertionError: 1 is odd&#10;assert (1 % 2) == 0">subtests = &lt;_pytest.subtests.Subtests object at 0x103b1d580&gt;

    def test_subtests(subtests):
        """Simple subtest example"""
        for i in range(2):
            with subtests.test(msg="is_even", i=i):
&gt;               assert i % 2 == 0, f"{i} is odd"
E               AssertionError: 1 is odd
E               assert (1 % 2) == 0

samples/test_sample.py:87: AssertionError</failure><system-out>--------------------------------- Captured Log ---------------------------------

</system-out>
<failure message="contains 1 failed subtest">contains 1 failed subtest</failure>
<system-out>--------------------------------- Captured Log ---------------------------------

</system-out>
</testcase>

• a detailed description of the bug or problem you are having
• output of pip list from the virtual environment you are using
• pytest and operating system versions
• minimal example if possible

Start by reproducing the subtest example in samples/test_sample.py, especially test_subtests at line 87, and inspect the generated JUnit XML. Trace how pytest's subtests integration is represented by the JUnit reporting path. Done means each subtest appears as its own while the report still represents the top-level test correctly.