Hybrid Thruster-Rover Accelerates Uncontrollably and Self-Destructs

Environment

• Game Version: Space Engineers 2 (VS2.3.0.2793)
• Setup: New Quickstart, no mods, built inside the barn.

Vehicle Design

• Chassis: Cockpit, gyro, cargo container, connector, battery, 4 wheels.
• Thrusters: 2 forward atmospheric boosters (grouped FWD), 4 upward atmospheric boosters (grouped VERT).
• Configuration: Thrusters set to 100% override, grouped on toolbar (VERT and FWD groups) to toggle on/off.

Steps to Reproduce

1. Build the hybrid rover.
2. Before testing thrusters, test the rover. Drives normally.
3. While parked (parking brake ON), test the vertical thrusters. Result: Thrusters fire normally, chassis shifts/hovers, no damage occurs.
4. Turn OFF the parking brake.
5. Attempt to drive or toggle the forward thrusters.

Observed Behavior

Once the thrusters have been activated at least once, releasing the parking brake triggers severe physics anomalies:

• Forward Thrust Enabled: The vehicle accelerates forward unstoppably and ignores the "turn off" command until it crashes.
• Forward Thrust Disabled (No Input): The vehicle immediately accelerates backwards uncontrollably.
• Holding Forward (W) with Thrusters Disabled: The vehicle only crawls slowly forward, as if fighting a massive, invisible reverse force.

Additional Notes

• The Workaround: The bug only stops if the thrusters are completely deleted/removed from the grid. Simply turning them off, disabling them, or grinding them down to an incomplete state does not resolve the phantom reverse force.
• The Trigger: The vehicle drives completely normally on its wheels until the thrusters are fired for the first time. Once fired, the grid enters a permanent "death ghost reverse thrust" whenever the parking brake is released.

Attachments

• Video of behaviour
• Save Game File, zipped