Setup as photo attached.

A 2-clock signal is input to the input A of a comparator, and a 1-tick-delayed output is input to the input B of the comparator.

What I expected is the output should be a pattern of 1000, as the 1-tick-delayed input is turning off the second "on" signal of the 2-clock.

However the output is all 0.

The same setup is tested with 3 and 4-clock (repeater with 2 or 3 ticks delay), and worked as expected, so I think the 2-clock case is a bug.

BTW, I got the expected output with a 2-tick delay repeater on the feedback.