Bug in debug world (Oh, the irony)

What I expected to happen was the comparator I right clicked to change back to the 'subtract mode'.

What actually happened was the comparator spawned about 20 stacks of comparators and crashed the game.

Steps to Reproduce:
1. Find the comparators in the debug world.
2. Find the one in subtract mode facing towards another comparator.
3. Right click it a couple times.