System Information
Operating system: windows 7 64bit SP 1
Graphics card: Geforce GTX 1060 6GB, driver 436.48

Blender Version
Broken: Blender 2.83.5
Worked: (newest version of Blender that worked as expected)

Short description of error
I was following a pipe creation tutorial: https://www.youtube.com/watch?v=pNZPBzt_HKc:

At 2:10min. into the video the video presenter comes across a glitch in the blender pipe extrusion code.

I followed his example without beveling the corners, my pipe extrusion also has uniform extrusion problems: see (pic 1)

Then I replicated the example in SketchUp using the SketchUp followme command, and imported the Blender STL file next to it: see (pic 2)

One can see the pipe diameter extrusions in Blender vary. while in Sketchup they stay uniform.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).