Hopper Priority System Changed

The hopper priority system when a hopper faces to the side seems to have (unintentionally) changed in between the previous update and now.

Behavior:
Attached is a diagram of a hopper facing to the side. During the recent update, items placed in Container A would always travel to Container B. Once Container B becomes full or deactivated, the items will not travel to Container C and instead stay in the hopper/Container A.

In previous updates, items placed in Container A would first travel down into Container C. Once Container C became full or deactivated, items would travel to the side into Container B.

I initially noticed this because my automatic sorting systems suddenly broke when updating, and I finally traced the issue back.