Observer clocks change frequency randomly

I’ve noticed that regular observer clocks can sometimes change their frequency. They usually pulse relatively slowly but can sometimes start pulsing faster (the same frequency as a torch burnout) for a short time. This makes them unreliable for timers or pulsing droppers at full speed. If this issue is fixed i would suggest making them always pulse at the faster frequency. Best way to recreate: Place 2 observers facing each other and make one of them power a dropper. Then listen for the change in the sound. This happens more frequently if there are more redstone mechanisms around.