Furthermore, the problem has already existed in 14w28b, so it's pretty sure that it isn't related with the block-delay-issue, which first appeared in 14w29b (as far as I know).
As far as I know, the "block-delay"-thing is only visual. Additionally, the repeater was still blinking after I relogged/waited for several minutes.
Why is no one interested in this problem? It's actually not that hard to prove that it exists.
@Anon Ymus: Yes it is
@[Mod] Galaxy_2Alex Yes, it is still an issue in the current Minecraft version; I just checked it. Sorry for my late reply, but I haven't found the time to update this bug report.