So it took me a while to get back on this as I hadn't bought any extra recipes or runes yet but from my tests I'm able to create (some potions) that use the light rune:
So you are using the correct runes as well right? Cause the runes you get in the beginning are plant and light and for growth (as well as shrink) you need the Earth rune (buy it from the alchemy shop).
I tested creating the minor height growth potion red mushroom + pixie dust mixture, upper earth, right light and it created the growth potion for me.
The minor shrink potion as well with pixie dust + pixie dust mixture bottom earth, right light. So far I see no bugs with that.
I don't really see a reason for it not working. I don't really remember if I downloaded version 0.3 from here or from the patreon but with 0.3 in a new folder I had no problems at all so far. Haven't tested all recipes yet due to lack of runes though.