Repeater blinking / powering itself

Repeaters will reactivate them selfs if there is power on the output side.

What I expected to happen was:
That the repeater would lose power after losing the input signal.

What actually happened was:
The repeater kept blinking on and off while it wasn't powered.

Steps to reproduce. (see image from top to bottom)
1. power the output side of a repeater.
2. power the input side of a repeater.
3. remove power from the input side of the repeater.
4. bugged repeater is created