Like you can see on the screenshot (took me quite a few trials) the repeater is on for one IG-tick, even if its not powered! This occurs only if the repeater is facing the "f1" direction
Its not a very important game-breaking bug, but still a bug that needs some attention.

What I expected to happen?
Just a not-powered repeater

What happened instead?
The repeater flickered for one InGame-tick

Steps to reproduce:
Just arrange the redstone circuit like shown in the picture, then place the repeater.
Important notice: This only works in "f1" direction!