Wasn’t this omitted intentionally because it was a dud?

Python 3.5.9:

There were no new changes in version 3.5.9; 3.5.9 was released only because of a CDN caching problem, which resulted in some users downloading a prerelease version of the 3.5.8 .xz source tarball. Apart from the version number, 3.5.9 is identical to the proper 3.5.8 release.

https://www.python.org/downloads/release/python-359/

Looking at the commits, I think 3.5.8 may have been removed by accident:

• 3.5.8 final was added on its release date in 5b10add

• Three days later, 3.5.8 final was left in place when 3.5.9 final was added on its release date in 28c92ac

• Seven months later...

• 3.5.9 was accidentally removed and put as a future release in 23585d7 (3.5.10 should have been added as a future release)

• Two days later, the previous accident was cleaned up in 94a7f4c, but also removed 3.5.8

Perhaps it would make sense to add it back, but with a caveat in parentheses like "(replaced by 3.5.9 due to ambiguity with an incomplete pre-release build that escaped the release process)"?