Hoppers do not pass items back and forth at a regular speed and comparators can not read them correctly

Hoppers do not work as they used to with this version.

Make a hopper clock. Stick a comparator on each end. With the current snapshot the comparators do not flash with the movement of the hopper clock. Now try this again with 16w41a and it works as expected.
Hopper clocks are now broken. The hoppers do not pass the item back and forth at a regular speed with the current snapshot, and do not trigger the comparator correctly. This release has broken the previously correctly working action.