description failed to render despite long_description_content_type="text/markdown"

[stef]

Describe the bug
i have exactly the same problem as in #4079

Expected behavior
succesfully uploading a new version of a package using:

python setup.py sdist upload --sign

i have prior to this run pip install -U twine wheel setuptools
i also removed all language indicators following ```
i also ran twine check dist/pkg... which responded with `PASSED`

[stef]

this is the package i tried to upload: https://github.com/stef/pwdsphinx/

[stef]

what ever i do i always get:

Upload failed (400): The description failed to render in the default format of reStructuredText.

[stef]

figured it out myself. it turns out that readme_renderer does not like this line:

sphinx: a password **S**tore that **P**erfectly **H**ides from **I**tself (**N**o **X**aggeration)

if i put a space after each emphasized letter it works.