Summarizing an offline issue raised by @vyasr since it is quite complicated. When building from the current main branch (commit 72acaaf), locally I observed:

• building sdist -> cuda/ccudart.pxd & co are there
• building wheel (directly or through sdist) -> .pxd/.pyx are not there

Unfortunately this has impacted the released wheels too:

1. Top-level .pxd/.pyx files missing (ex: cuda/ccudart.pxd & co)
   • ex: cuda_python-12.6.2-cp311-cp311-win_amd64.whl
   • also observed in conda-forge: Latest 12.6.2 packages are missing some Cython files conda-forge/cuda-python-feedstock#95
2. A extra bindings module is installed to site-packages
   • ex: cuda_python-12.6.2-cp312-cp312-win_amd64.whl

(I only did a quick random checks, not systematic.)

I believe another hot fix is unfortunately needed in order for us to also fix wheels (if only conda packages were impacted, we could've just included the patch and rebuilt with a higher build number).