How to reproduce:
1. Open the attached project "BasicControllers.zip"
2. Open Assets/_Core/Animations/Characters/CharacterPawnAnimator.controller
3. Open "Climbing" in the Animator window
4. Open "Climb" Blend Tree
Expected results: The second parameter in the Blend Tree is 0
Actual results: The second parameter in the Blend Tree is "NaN"
Reproducible with: 2022.3.7f1, 2023.1.0a10
Not reproducible with: 2021.3.29f1, 2023.1.0a11, 2023.1.8f1, 2023.2.0b4
Reproducible on: Windows 10