Ok, now the weirdest part about this bug:
Sep 10 2019
Feb 12 2019
Ok, just got an idea to do exactly the same test with different application not installed but unzipped. Exactly the same result, so it's OS issue. false-positive confirmed.
Initially after going back to PC with windows 7 and newest build checked previously on win10 I had very weird results but after some testing in the end I know how to reproduce it repetitively. However issue seems to be very edge case and it might not be even Blender but some operating system caching.
While testing version: 036ec5cae4f7, windows64 on different PC with Windows 10, I'm not experiencing this issue. I will try this specific version in ~10 hours back on PC from which I reported it and if I still have this issue, it means it might be specific to my PC. Therefore bug report is most likely false-positive. I will update with a comment later today.
Feb 11 2019
When looking for this issue I found only very old similar bug mentioned for version 2.72: https://developer.blender.org/T42288