Weird one.
Repro:
- Add a default Tab element to the page
- Click the Individual Tabs Module
- Scroll down and click the toggle to turn on Box Shadow
Observed:
The Inspector will immediately throw the “Uh Oh” message, and you won’t be able to load the Individual Tabs module again for that element – unless you go into the Dev Console and add the ! to the tabs_tabs_box_shadow_dimensions field.

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Here’s the console dump:
