This however works fine:
` Python 3.10.6 (main, Aug 10 2022, 11:40:04) [GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

import numpy as np
a = np.ones((100, 100, 3))
a[0:50, 0:50].shape
(50, 50, 3)
`