I have the same pb as others (here and on Reddit). On the LC version, the Grappling Hook quest is not validating.
I tried /scoreboard players set [name] Holding Hook 1 and it didn't worked.
I tried a lot of times (5 !) to re-craft it with and without the deconstructor and still not working.
Please, give us a fix, even if it is modifying command blocks.
Otherwise, this is a reallllllly cool map, maybe a be boring to get water but that's the main thing of the map.
Did you have that space in "Holding Hook?" It should be one word.