It's true that there's a difference. Until now, Mc has been more passive, and now they're taking a more active role. They initiate a lot of choices. Yet I didn't feel I'd made them much more mature. It's a childish choice to want to go back to the camp, in the chaos when there's danger. Mc has a tantrum and Mickhail points it out. As for the lock-picking part, I thought Mc being so impress that they almost forgot their mission was a sign of their childish side...
Also, do you think Mc's vocabulary is too advanced?
Whatever it is in my mind. It's an act. Mc plays at being big and strong, mature, but they're going to fall apart eventually. Because yes, they are a child.
I hope you'll continue your journey with me, even if Mc seems to you a little out of character at the moment. π₯°