I'm not sure I've ever seen or heard of this in terms of a bug, but it might help to know which version of Blender you are using here specifically.

I'm not sure I understand the issue fully. Are you saying the rotations start to go berserk after a certain rotational degree? When you set up the rig, did you parent the IK targets with Make Parent > Keep Offsets? It's important that your targets were parented with Keep Offsets.

Otherwise, it's really impossible to say what could be going wrong here. There could be literally a dozen things about the armature setup causing issues. I've never experienced anything like this yet, and I've been working with my own rigs in animation for quite a while now. However, if it is a bug, it will help to know the version because it's probably been fixed in later versions.

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