Partially fixed:
You can still trigger the issue by leavJust noticed that the blinking the shipcore while it's flashing whitealso applies for all near by entities. Then entering it again.And the blinking can get stuck for them, (see how to reproduce)but not for your own entity.
Now however it doesn't happen if you switch between ship <-> build mode in the middle of a flashThe original issue is fixed but yeah, the blinking should only happen for your own ship (excluding docked entities).