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a known issue. quoting from here:

There are these options:

Don't install this loader package (it is mostly for standalone distributions): #12977 (comment)

Old behavior can restored via these CMake variables:

OPENCV_SKIP_PYTHON_LOADER=ON
OPENCV_PYTHON3_INSTALL_PATH=...site/dist-packages location... (not required since #13254)

setup.py is not complete for now and its usage is very limited (it is a bit tricky to install native binaries with their dependencies in Python). Try to install this loader in develop mode instead:

python3 setup.py develop
or
pip install -e .