Pim Schellart [X] has discovered that we don't have test coverage for converting less-common Eigen types to Python. This is not urgent, but it should be fixed.
As of DM-14834, we're using “pybind11's native Eigen wrapping instead of ndarray EigenView”. Does that render this ticket obsolete? Jim Bosch, I'm not familiar enough with this code to tell at a glance; maybe you are.
Yup, as you guessed; marked as Invalid.