c.f. https://youtu.be/RT5uodZnPt0

Exp. 1

• Create a ship with 1 core and 1 rail basic and use create docking to add a docked entity.
• Use /shield_damage -220 on the parent entity to refill its shields
• Hit the docked entity with a 21 block cannon projectile (210 damage), the parent entity shields absorb 210 damage
• Use /shield_damage -210 on the parent entity to refill its shields
• Hit the docked entity with a 22 block cannon projectile (220 damage), the parent entity shields absorb nothing

Expected:
the parent entity shields absorb 220 damage

Exp. 2

• Create a ship with 1 core and 1 rail basic, use create docking to add a docked entity, then add a rail basic to that entity and create a second docked entity
• Use /shield_damage -220 on the parent entity, /shield_damage -120 on the "intermediate entity", /shield_damage -20 on the leaf entity
• Hit the leaf entity with a 14 block cannon projectile (140 damage), the leaf entity absorbs 19 damage, the intermediate entity absorbs nothing, the main entity absorbs 121 damage

Expected:
the leaf entity entity absorbs 19 damage, the intermediate one absorbs 119 damage, the main entity absorbs 2 damage