Describe the Bug

When Brass Tunnels are used in a group, their throughput drops significantly.

Reproduction Steps

1. Feed items from a creative crate through a chute onto a belt, with some non-blocking sink at the other end of the belt (e.g. let items fly off the end, or chute them into lava, whatever).
2. Place another belt running parallel to the first one, again feeding into some non-blocking sink.
3. Place a brass tunnel on the first belt, observe the throughput of items across the tunnel is the same as across the plain belt.
4. Add a brass tunnel adjacent to the first one, on the second belt.
5. Observe that the throughput of items across the tunnel group is now significantly lower than before.

Expected Result

Brass tunnel groups should have at least as much throughput as a single tunnel. Ideally they would have the same maximum throughput as the number of inputs or outputs to the group (whichever is smaller).

Screenshots and Videos

Screenshot of setup with single tunnel, normal throughput:

Screenshot of setup with group of three tunnels, lowered throughput:

Crash Report or Log

No response

Operating System

Linux

Mod Version

0.5.0i

Minecraft Version

1.18.2

Forge Version

Fabric 0.14.22

Other Mods

No response

Additional Context

No response