Staging Cubic octagonal strut
When a module is attached to the main craft via the "Cubic octagonal strut" onto a separator, the module remains frozen and does not react to gravity or other forces. Example: I tried to recreate perseverance and its helicopter. When I attached the helicopter via a Cubic Octagonal Strut to a separator, the helicopter remained frozen. When I attached it via the Small Inline Reaction Wheel, it reacted normally.
I have a video but it is unable to upload despite being 16.7 MB.
#3 Updated by MalcolmCooks 20 days ago
this also affects the octagonal strut
I ran into this bug in kerbin orbit, here's what I found: when you switch to the bugged module, the navball shows 0 orbital velocity, and it begins accellerating with no external forces. if you decouple and then go to the tracking centre, the bugged module has teleported above kerbin's south pole with 0 velocity.