oooh wait I have an idea of what it could be. Did you possible have a good amount of momentum going to hit that spring from the right moving left? Technically the way we do springing you may have fallen in that hole on the left of the spring there (long story short the springing seed and the seed on the vine are separate gameobjects internally and there may be some messed up state)
Your summary is accurate, it launched me up and loaded the camp but also did the whole fall sequence. It just happened to me again, this time at the jungle->desert camp, but I don't remember about the momentum. Maybe. I'll pay better attention next time.
I think you might be right, I was just able to replicate it by hitting a spring with a lot of speed when there was a hole on the other side. The level indicator on the vine went right over the hole. Of course I forgot to capture video before I opened up the game with the intention of replicating a bug! Maybe later.
Got it on video!