field_group_pre_render_div is building the display: none from a logical check. This is coded quite hard. Suggested fix - Add the display: none via CSS on the wrapper.
Repeatable: Always
Steps to repeat:
Download and install Field Group
Expected Results:
With Javascript turned off in the browser 'Collapsed'
Actual Results:
With Javascript turned off in the browser 'Collapsed'
Closed: outdated
1.4
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.