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When editing a node, tab group titles are missing

When editing a node, tab group titles are missing:

Missing Table Group Titles

The HTML looks like this:

<ul class="horizontal-tabs-list">    <li class="horizontal-tab-button horizontal-tab-button-0 first selected" tabindex="-1"><a href="#edit-group-m"><strong></strong><span class="summary"></span><span id="active-horizontal-tab" class="visually-hidden">(active tab)</span></a></li>    <li class="horizontal-tab-button horizontal-tab-button-1" tabindex="-1"><a href="#edit-group-content"><strong></strong><span class="summary"></span></a></li>    <li class="horizontal-tab-button horizontal-tab-button-2" tabindex="-1"><a href="#edit-group-sidebar"><strong></strong><span class="summary"></span></a></li>    <li class="horizontal-tab-button horizontal-tab-button-3 last" tabindex="-1"><a href="#edit-group-related-content"><strong></strong><span class="summary"></span></a></li> </ul>

So the titles are already not printed, so it is not a CSS issue.

Is this a known issue? How can I start debugging this?

This article was republished from its original source.
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When editing a node, tab group titles are missing

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