Multitile airlocks drift one tile off

[LightAnarchy]

Description of issue

I built two multi-tile airlocks. They were a bit finicky to get into place but they worked. Now they've mysteriously drifted one tile off into a wall. This is the second time this has happened.

Difference between expected and actual behavior

Multi-tile airlocks should not move from their position by themselves.

Steps to reproduce

Not sure. Build a multi-tile airlock and wait?

Specific information for locating

/obj/machinery/door/airlock

Length of time in which bug has been known to occur

Couple hours.

Client version, Server revision & Game ID

Client Version: 512
Server Revision: e549094 - newmap - 2018-11-19
Game ID: bXp-dchq

Issue bingo

Please check whatever applies. More checkboxes checked increase your chances of the issue being looked at sooner.

• Issue could be reproduced at least once
• Issue could be reproduced by different players
• Issue could be reproduced after a restart
• Issue happened recently (less than 7 days ago)
• Couldn't find an existing issue about this