Here's the thing: even if I complete all her quests,
I'll still be missing one.
After completing her second quest, I didn't get the upgrade.
Either this upgrade is easy to miss, or it's a bug.
After spending 5000 bits to purchase the recipe, when I returned to Middle Manager Twombly, he couldn't recognize the recipe in my inventory.
This caused the quest to get stuck. Has anyone else encountered a similar issue?