Ah, try running on a specific

python_test

target like

./pants src/pyfleet-vehicle-spec/tests/test_panion_ds_vehicle_specs.py

What's going on is that the target generator

python_tests

(with an s) "moves" the field to generated targets and doesn't keep it itself. That was necessary for

parametrize()

+

overrides

to work properly cc @witty-crayon-22786, not sure how we could avoid user confusion here. It is definitely nuanced, and currently undocumented