"data-requires-python" attribute does not work with group repository

data-requires-python is not present using group repository pypi-all.

  Found link http://nexus-dt1.cloud.com/repository/pypi-all/packages/jinja2/3.0.0a1/Jinja2-3.0.0a1.tar.gz#sha256=c922560ac46888d47384de1dbdc3daaa2ea993af4b26a436dec31fa2c19ec668 (from http://nexus-dt1.cloud.core.pw/repository/pypi-all/simple/jinja2/), version: 3.0.0a1

However, when I point pip to member of pypi-all - pypi, I get correct response:

  Skipping link: none of the wheel's tags match: py3-none-any: http://nexus-dt1.cloud.com/repository/pypi/packages/jinja2/3.0.0a1/Jinja2-3.0.0a1-py3-none-any.whl#sha256=c10142f819c2d22bdcd17548c46fa9b77cf4fda45097854c689666bf425e7484 (from http://nexus-dt1.cloud.core.pw/repository/pypi/simple/jinja2/) (requires-python:>=3.6)

What information should I provide to fix this bug?