If you try to save the tab options form, you will have no joy.
The validation falls through to displayPluginBase::validateOptionsForm when it assumes any section with _options appended, such as style_options, tab_options is a plugin type. This is true for style but not for tab. So it then goes on to try and find a plugin manager for 'plugin.manager.views.tab' which does not exist.
We need to stop this from happening, so we can either check this is a plugin type, or change the logic a bit more. I think the first is fine. Also needs a UI test for the tab options...