When placing 2 hoppers facing into each other with a single item moving back & forth, taking a comparator output from a hopper locks the comparator in an always on or off state instead of pulsing like it should.

What I expected to happen was...:
The comparator should pulse providing a clock

What actually happened was...:
the comparator stays on or off after the items initial pass.

Steps to Reproduce:
1. set 2 hoppers facing into each other
2. take a comparator output from either hopper or both
3. throw a single item into a hopper and watch the clock break.