Describe the issue

On my custom map/level I am able to place benches in front of most doors, causing patients inside to trigger the "empty action queue" error once their treatment finishes. The benches will be used by queuing patients like normal. I wasn't immediately able to reproduce this on a campaign map.

Savegame: https://drive.google.com/open?id=0B1z_KXLTgDplS2V3c3RhaExjb2s
Level: https://drive.google.com/open?id=0B1z_KXLTgDplUmxab3R1MEw2dFE
Map: https://drive.google.com/open?id=0B1z_KXLTgDplcm5vMnpKQ3ZkQ1k

Expected Behavior

I shouldn't be able to build benches in front of doors.

System Information

CorsixTH 0.60 on Windows 10.