Kerbal Space Program

KSP Version: v0.90.0.705 Beta Windows 32-bit [OS Windows 8.1 64-bit]
What Happens: Rockomax Brand Decoupler clips upwards into the fuel tank, or in some cases explodes, when staged, if translated too far up.
Mods / Add-Ons: All Stock

Steps to Replicate:
1) Make craft that includes a large size fuel tank, an LV-909 engine, and a Rockomax Brand Decoupler.
2) Translate the decoupler upwards until it touches or almost touches the fuel tank above the engine but does not clip into it.
3) On the launchpad, stage the decoupler.

Result: Decoupler clips upwards into the fuel tank, or in some cases explodes.

In the VAB, the engine looks like it fits comfortably inside the decoupler, which hides the mismatched fairing since the LV-909 is a small engine and the decoupler is a large part. However, instead of a clean separation, I think the game is interpreting an extreme part clipping scenario and then behaves against the player's intuition.

Fixes/Workarounds:
In the VAB, translate the decoupler back down until symptom no longer occurs.

Other Notes/Pictures/Log Files:
- Images Link: <iframe class="imgur-album" width="100%" height="550" frameborder="0" src="//imgur.com/a/HMppi/embed"></iframe>