Ive had what seems to be two different kinds of greenstone in my inventory, neither of which is registering in the alchemy station as greenstone when attempting the 618 spell component recipe. I don't know if this bug is showing elsewhere, but both freshly collected greenstone and a 99 stack I collected from level 1 up haven't been working.
To note, yes, I did throw my 99 stack away before trying to collect more.
Greenstone
Moderators: Active DMs, Forum Moderators, Contributors
Re: Greenstone
Find a raw greenstone, cut it, drop your old grenstone stack, put your new crafted greenstone into your inventory and then pick up your old greenstone stack. Worked for me in multiple instances when this bug kicked in.