Widget changes in customizer ajax error to many options?

The customizer can not/will not track changes to more than one option. I am not sure why, but that is a definite design limitation. Most likely your widget code tries to update an option.

In general, regardless of customizer, you should not do that. All of a widget settings should be limited to its on storage in the relevant options. Any global setting should have a global admin interface to control it, like a dedicated admin window.

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