Game Version number:
1.2.1.169 (Steam)
AND
Experimental Build 1.3.0.25 (Steam)

Modded?: No

Issue Description:
I've searched the internet and I can't find anyone else reporting this issue.
The issue is that when a mission has been built with compositions in Game Master and the Missions is Saved, upon loading that mission some compositions get a duplicated mesh inside of itself. It's not two seperate compositions/prefabs loading since both the meshes are moved when moving the object in GM. It seems like just two of the same meshes appears on the same prefab. This causes performance issues and looks poorly when playing.

Last note, I observed this issue a while back but did not report it since I thought this must have been wide known.