Windows 64bits & MacOS
Broken: 2.79.3 actual master
Bevel operator percent mode doesn't work properly like we can see in this image (see the weird curve in the bevel solution)
This is the correct behaviour
And strange behaviours happens in other situations, for example, in this model (box without caps and with top side scaled). In this case make same that offset edges.
Exact steps for others to reproduce the error
Create similar situations to example images and make a bevel, it allways happens in my builds (master and soc-2107-normal-tools) in windows and macOS