Calling clear() on QBarCategoryAxis does not clear category names

In a QChart with a QBarCategoryAxis attached, after having set some category names with axis->setCategories(...), they aren't actually cleared after calling axis->clear() as they are supposed to be.

Calling axis->setCategories({}) (with empty list) produces the same result (visually), at least in an otherwise empty chart.

As a workaround, xAxis->setCategories({""}) produces the desired result.

See attachements for minimal working example.