Hi B_CANSIN and welcome to the MSZ Forum.
I will admit that I don't know much about working with 3D video, because I don't make 3D projects, however I do understand the basic workflow.
I am pretty sure you have found a BUG in Vegas Pro 13.
I don't remember having this problem in Vegas Pro 12.
I can confirm the exact same behaviour on my PC and you are correct that Movie Studio Platinum 13 does not have this problem.
What I suggest you do, is use Top/Bottom (Full) mode instead, which does work.
I don't own a 3D capable monitor, so the few times I worked with 3D, I always use Anaglyphic (red/cyan) mode and put on my 3D colour glasses.
I'm not sure who you would report this to now, because Sony has sold Vegas to Magix.com
They have taken over support and development.
Regards
Derek
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