spacecannon mod seems ineffective against draconis dragons

[dennisjenkins]

Minetest-5.3.0 (client and server).
Relevant mods: "technic_plus", "spacecannon", "draconis", "jumpdrive".
Survival mode.

I built a "ship" with a jump drive, HV technic batteries and solar, and 16 "red energy cube space cannons" (very expensive to build in survival mode...). I've been trying to fight a dragon from draconis mod using this ship. I hit the dragon w/ the cannon fire, but the dragon seems to take no damage, and the logs confirm this. I'm not sure why. Note the "damage=0" in the server logs.

I've also tried attacking the dragon directly w/ a diamond sword, while wearing full diamond armor. The dragon takes no damage and I die quickly. Are these things immortal? I have to imagine that the author of the dragons intended for them to be killable.


2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (243,10,-781) (id=2449, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (243,10,-781) (id=2500, hp=1), damage=0
2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (243,10,-781) (id=2449, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (243,10,-781) (id=2498, hp=1), damage=0
2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (241,6,-779) (id=2444, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (241,6,-779) (id=2504, hp=1), damage=0
2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (241,6,-779) (id=2444, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (241,6,-779) (id=2501, hp=1), damage=0
2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (241,6,-779) (id=2444, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (241,6,-779) (id=2499, hp=1), damage=0
2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (243,6,-779) (id=2445, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (243,7,-779) (id=2514, hp=1), damage=0
2021-01-17 10:26:02: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (243,6,-779) (id=2445, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (243,7,-779) (id=2513, hp=1), damage=0
2021-01-17 10:26:31: ACTION[Server]: LuaEntitySAO "spacecannon:energycube_red" at (243,14,-783) (id=2595, hp=10) punched LuaEntitySAO "draconis:dragon_ice_entity" at (243,14,-783) (id=2596, hp=1), damage=0