Known issueFixUpdated · 2 replies on Steam
Sapphire Safari: Rope Climbing Bug (Workarounds)
Short answer
Suggested fix (unconfirmed): Verify your game files or reload a previous save. If you remain stuck, crouch or jump to break the collision state.
The problem
The second rope climbing up to a wooden platform on the side of a rock face always bugs my character and they just get stuck. They will not climb but also will not move away from the rope. It's the rock/mountain thing near the pools with a waterfall that leads to a hidden area with more waterfalls.
Did this work for you?
Source: original Steam Community discussion. Quotes are shortened; all credit goes to the posters.