[ 1.190] All physics break down, reproducible
Load the world, note that everything seems stable. Nothing will happen unless you do the following:
Get in the ship on the left with all the spotlights and cargo containers. Move it underneath the free connector (but do not make a connection nor get close enough for a magnetic attraction), lower it to the ground, and turn off its dampners. Get out and walk over to the button panel, then turn and face the ship. In a moment you should lose control of the player, and every piston, rotor, and wheel in the base, possibly the world, will detach and every object will float away as if under water.
Only this specific set of steps will reproduce the issue, but it is 100% when the steps are followed. Very strange.
This save was also experiencing strange phantom forces on dampners which were resolved by exiting and reentering the cockpit after pressing Z. Both of these issues started with 1.190, the world ran perfectly with exactly this set of mods and setting previously.