breaking the torch on the left and placing it back, will trigger the clock on the right side.

It works the same if you break and replace in the right side.

Notice that between the two "redstone clocks" there is a gap and they are not connected!

Items needed to recreate the bug:

4 solid blocks, 2 redstone dust, 2redstone torch.

3(long)x2(wide)x2(tall) space.

build them like in the photo.
break one of the 2 torches, and place it back.
It will trigger the other one too, even if it's not connected.