Inverting redstone torches prints "lskdjfldskjf" to log

I was unhappy with the new observer block timing because the current output doesn't allow you to make a redstone torch pulsate, so I tried using a repeater to delay the signal.

It worked, but also spams the console with: "lskdjfldskjf".

To reproduce (also see the attached screenshot):

• Place an observer block, place a repeater behind it and set it to 2 ticks.
• Trigger the observer block.
• Watch the console output.

Pictures show the circuit I used as well as my console output.