Minecraft 1.13-pre6, Minecraft 1.13-pre7
The output frequency of redstone dust connected observers differs depending on the signal strength observed by the first observer.
The below is a 2-clock circuit, which two observers mimic when the first of them observes redstone dust with signal strength 2, 4, 6-8, or 10-15. However when the first observer observes redstone dust with signal strength 1, 3, 5, or 9, since 1.13-pre4 the second observer instead erratically produces 3-tick pulses with 1-tick delay (see lower stripe of redstone repeaters in the images below).
Original, pre-edit description
The circuit below used to drop items from the dropper at a steady rate until it was empty, but since v1.13-pre4 the drop rate is significantly higher when the comparator output signal strength is 1 (i.e. when the dropper inventory contains fewer than 42 items). The drop rate thus changes when the inventory count drops from 42 to 41.
The issue is and could seem to pertain to the timings of the two observers:
- The issue goes away when removing the observer pointing into the dropper.
- The 2-clock signal (...11001100...) produced by the non-dropper-pointing observer remains unchanged as observed by a line of connected 1-tick repeaters.
More generally it appears that the abnormality occurs when the non-dropper-pointing observer observes a 1-strength signal, cause if we move it one block further away from the comparator, the behavior instead shows when the output signal strength is 2: