Nose to nose docked craft gives prograde impulse when engine firing retrograde

[Soda Popinski]

Game Version​

v4424

Operating System​

Windows 11

What Happened​

Docked my craft nose to nose, so when in prograde, the engine faces retrograde, but firing the engine gives a prograde impulse, increasing my orbital velocity, while the plume goes backwards into the craft instead of away from it.

What Was Expected​

I expected the engine plume to go away from the engine, and to get a retrograde pulse, as the engine was facing the direction of travel.

Reproduction Steps​

1. Get a craft with docking ports in orbit, or load from the attached savegame
2. Timewarp until its on the day side (unknown if this is needed)
3. Undock the nosecone from the front craft, and switch back to the main craft
4. Decouple the "CSM" from the "LM"
5. Undock the decoupler from the LM
6. Switch to the CSM and rotate and target the LM + Upper stage stack (right clicking on the CSM docking port [not the LM docking port], lets me select it as a target*)
7. Switch tot he LM + Upper Stage stack, and target the CSM in the same way (right click the LM docking port and select target)
8. Do split second engine ignitions to get the craft to go closer together
9. Dock with the right click menu
10. Set ship to prograde, which should be based on the CSM capsule, so the LM + Upper Stage engine is facing forward (should give a retrograde impulse)
11. Ignite engine: The plume will go backwards into the craft, and periapsis / apoapsis will increase as if getting a prograde impulse

Reproduction Rate​

Sometimes

Additional Info​

• Video/Screenshots:
• Save File: Attached
• Other Notes:
  • It may be intermittent, as when I first tried to reproduce this, it didn't work, though I was controlling the CSM that first reproduction attempt.
  • Saving and reloading from the re-docked state produces expected results.
  • *This seems backwards, and likely a different bug