Don't worry about it, I think I have one more in my inventory, had to leave in a rush when I was on last.
Edit: Turns out I didn't, but I got two from the magical forest. They were both Iter beans, which is not terribly helpful since Iter is pretty easy to get via boats. I'm not sure if the fact that all three beans we've found are Iter is some sort of coincidence or not, but it's certainly not helpful. I planted both on the silverwood in the swamp at any case.
I also went ahead and visited the eerie island with its obsidian pillar. Turns out the pillar held some sort of boss, the crazed hemathurge. I actually managed to kill him without dying and went on to get a couple of ethereal blooms, grey mystical flowers and enough language scraps for two more translators (we now have three). We'll have to decide what to use them on. I already translated a lexica botanica and a tome which revealed some thaumaturgy research. I believe the rest of the grimoires and tomes are the same thing as these, so we might want to translate the journal scraps instead. These might only be backstory though, but personally I love backstory.
The obsidian pillar also held a blood magic altar and blocks related to it which I left for the time being. Blood magic doesn't sound like something we want to be messing with right now. Moreover, the visit to the island did not unlock ender pearl and blaze rod requesting, but rather "The Dark One" quests. The first one called for a bucket of blood. I'm gonna go ahead and leave those alone for now. Entities going by "The Dark One" doesn't strike me as good things to deal with when one wants to remove the taint...
Finally, I researched "Shovel of the Purifier" which is a shovel that works on tainted stuff at full efficiency. It seems like a good thing to have, so I started preparing things for the infusion. Didn't get very far, though.