Multiz shuttles replace open turfs with space.

[MistakeNot4892]

Description of issue

Copied from ScavStation/ScavStation#888
Moving multiz shuttles with open space replace that open space with /turf/space.

Difference between expected and actual behavior

Space type should be preserved between moves.

Steps to reproduce

Build a multiz shuttle, try to move it.

Specific information for locating

Unsure, cannot repro this locally due to not having a multiz shuttle handy.

Length of time in which bug has been known to occur

Unclear.

Client version, Server revision & Game ID

Reported on Scav main, which is current Neb stable.

Issue bingo

• Issue could be reproduced at least once
• Issue could be reproduced by different players
• Issue could be reproduced in multiple rounds
• Issue happened in a recent (less than 7 days ago) round
• Couldn't find an existing issue about this