PyPI Package with single letter names cause 404 to be returned.

We proxy pypi.org in Nexus. Among the packages we use is one called "q".

Before our upgrade, we were using version 3.20.1 - no issues.

We recently upgraded from 3.20.1 to 3.24.0, and now - when using pip to install "q" - Nexus returns a 404 error.

Steps to Reproduce:

• create pypi proxy to pypi.org
• using pip, point to pypi proxy repository, and attempt to install "q"
  • Nexus returns 404
• install a package with a longer name "python-cinderclient" - it works
  • successful

Just to double check it wasn't upstream:

• attempt to install "q" or "a" from upstream url
  • successful

To check that it's specifically one-letter packages:

• install another single letter name ("a", for example) - it returns 404
  • Nexus returns 404
• repackaged "q" (changed package info to call it "qq")
  • successful

 PS: I even downloaded the package and uploaded it to our local pypi publish repository - same issue