The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.forge.api.event.block.fluid.FluidPlaceBlockEvent;

FluidPlaceBlockEvent extends BlockEvent. That means all methods available in BlockEvent are also available in FluidPlaceBlockEvent

Name	Type	Has Getter	Has Setter
Name liquidPos	Type BlockPos	Has Getter true	Has Setter false
Name newState	Type BlockState	Has Getter true	Has Setter true
Name originalState	Type BlockState	Has Getter true	Has Setter false