Redstone bug

Repeating redstone mechanisms freeze after chunks are unloaded. (Single player or multi-player)

I expected my redstone mechanism to continue working when I leaves and get back on.

When I build a redstone mechanism that repeats itself it works until the chunks are unloaded i.e. When I guit the game. Then I have to reset it every time I leave and get back on.

Steps to Reproduce:
1. Build a redstone mechanism that can repeats itself without a switch.
2. Run the mechanism.
3. Quit the game.
4. Get back on the game.
5. Check the mechanism.