Release Notes:

https://robertsspaceindustries.com/en/comm-link/Patch-Notes/20445-Star-Citizen-Alpha-402

Known issues/things to avoid:

Fast storage and retrieval of ships breaks the hangar

Critical: PU - Locations - Personal Hangars - Actor - If player ungracefully exits while in hangar, hangar stows and does not unstow upon recovery

High: PU - Pyro - Jump Points - Locations / Spacescaping - Asteroids that surround the Stanton Gateway can be seen inside the Jump Tunnel and occasionally can cause fatal collisions when exiting the Jump Tunnel

Supply Or Die: Detatrine cargo that has already been destroyed will blow up again when you Quantum Travel, causing damage to your ship and other undamaged cargo. (Workaround: Remove dead cargo from ship before QT)

In other words, for that Hangar one, do NOT ALT+F4 while you are in your Hangar.