why gpu skin need Transform feedBack

Because of the IK or others ? But if my project do not has IK.How do I disabel the transform feedback.Thank you.

It’s not related to IK. Transform feedback is one of several ways to modify geometry on GPU. You can also do this by vertex shader and compute shaders. Doing this in vertex shader will make custom shader writing more complicated, compute shader requires newer GPU than transform feedback needs, so devs choosed this way. So you can ask devs to change skin system or just disable GPU skinning. But since you have no idea what it is just disable it.