How it happened: Get "Jump to platform" mission, use small tech to Complete mission, Stay parked on platform, Swap to another larger tech.
Platform does a partial Despawn as you swap. You are now clipped into the platform base. You can not move, and the platform can not finish despawning.
Apparently when you swap tech, there is a moment that you don't exist.
I don't know if it works the other way around as my larger techs can't make the jump.
Hopefully someone else will try this and confirm the bug.