Although Hemp only takes 1 Slot in the inventory once is is full you can't gather it even when you already have some so it should just add it to the stack
When i wanted to craft bows in 1.16a it first showed can make 0 and with every bow crafted it went up. Then as my bowstring was running out it started to go down again till i had no strings left
Dark Ritual seems interesting but sucks since even with artifact names it seems stupid to find the right shape. Also to few informations about how things work which is one of the most major mistakes devs can make.
Thanks for the heads up! This will be fixed in the next update.