Value Track: 'right_feet:rotation' has different interpolation types for rotation between some animations which may be blended together

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Godot Version

Godot 4.3.0 Windows

Question

My friend is making 2D animation. Godot gives this warning in yellow:

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scene/animation/animation_mixer.cpp:895 - AnimationMixer (at: root_kraw.tscn): 'walk', Value Track: 'right_feet:rotation' has different interpolation types for rotation between some animations which may be blended together. Blending prioritizes angle interpolation, so the blending result uses the shortest path referenced to the initial (RESET animation) value. (User)

What does it mean? What’s an interpolation types? Is it the same as interpolation mode? What does “between some animations” means?

Since it’s a warning, does that mean it’s bad? Why is it bad? Like, what sort of bad thing will happen?