The skipping for me appears to be random.
The affected machine. Note the unlit furnaces.
The machine in which I discovered the bug. Note the unlit furnaces.
The error occurs regardless of hopper direction.
My computer has 2GB RAM, lag is usual.
This bug only started occurring recently for me. This I cannot explain.
Unlike the linked bug, this happens in both creative and survival.
Many skipped hoppers are at the edges of chunks for me.