Putting conveyor belts on the cargo shuttle makes it not spawn crates to be sent to the station

[hanyuuuuuuuu]

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BYOND Version

516.1662

Issue Description

Putting a conveyor belt or multiple on the cargo shuttle (i.e for making a conveyor assembly for items to be shipped out into the cargo bay and not just to sit in the shuttle until you grab them manually) for some reason makes it unable to send crates to the station.

I know this is the case because, on round 45133, I conveyor belt assembly'd the shuttle. On multiple cycles calling the shuttle between the station and central, no crates appeared despite 6 plus a mail crate being in transit/delivery. Removing all conveyor belts and returning, then recalling the shuttle spawned all crates, but the cycle before conveyor belts were removed, the mail crate spawned within the tile that was in the normal, base conveyor belt that is supposed to lead into the shuttle when there's been no modifications to the shuttle itself (the southernmost conveyor assembly in the cargo bay), particularly the tile closest to the shuttle.

What did you expect to happen?

I expected to be able to use conveyor belts on the cargo shuttle without removing the ability for crates to spawn.

What happened instead?

No crates spawned on the shuttle until I removed all extra conveyor belts.

Why is this bad/What are the consequences?

Automating things is good if people put in the effort to create that automation (conveyoring the entire shuttle), should be able to automate the crate unloading/loading process easier.

Steps to reproduce the issue.

1. Fill cargo shuttle with conveyor belts (every tile)
2. Return to central
3. Wait for mail, or call a crate or multiple.
4. Call the shuttle back. Notice no crates.
5. Optional - Remove all conveyor belts, return, call shuttle again. You'll notice your crates have spawned.

When did the problem start happening?

Last round as of this message.

Extra information

No response

Relevant log output/runtime error