Deploying recipes now include a boolean property named keepHeldItem which decides wether the held item will get used or remains.
There should be a way to set this property, for example

event.recipes
   .createDeploying(waxed, [unwaxed,"minecraft:honeycomb_block"])
   .keepHeldItem();

@Prunoideae was working on an update to KJS Create as far as I know, pretty sure they included that in there as well

Implemented in #17 ^^