When Drupal\Core\Render\Renderer::doRender() processes #lazy_builder callbacks the #type defaults are already loaded, so any element with a #type property will not be rendered properly.
A #pre_render callback often adds new types in child elements only, when it becomes possible to have the type defaults loaded. With a #lazy_builder callback it's not common to return a child element.
Needs work
10.1 ✨
Last updated
The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
Enhances developer experience.
There is consensus among core maintainers that this is a major issue. Only core committers should add this tag.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
An alternative approach here would just be to call this on the $new_element
if (isset($elements['#type'])) {
$element += $this->elementInfo->getInfo($elements['#type'])
}
It's roughly 10 lines below where the renderer already calls it (off the top of my head when I hit this issue yesterday)
