How to reproduce:
1. Open any project with Input System Installed
2. Create an "Input Actions" Asset
3. Open it and create an "Action Map" on the left-hand side
4. Set "Action Type" to "Value"
5. Set "Control Type" to "Bone" and try to add a "Processor" with the "+" button
Actual result: Hovering over the "+" button shows a tooltip to add the "Processor", the button is enabled, and no indication that this action is unavailable is present. The only time the user is informed that this action is not available is when the "Processor" is added with a different "Control Type" and then changed to a type with which the processor is not compatible. The "Control Types" affected: touch, quaternion, pose, integer, eyes, double, digital, bone
Expected result: The action to add a "Processor" is either disabled or other indication of the problem is present and the user is not left thinking that this button just doesn't work
Reproducible with: 1.6.1 (2021.3.28f1, 2022.3.4f1, 2023.1.2f1, 2023.2.0a22)