In Drupal\Core\Render\PlaceholderGenerator::createPlaceholder() we assume that callback passed to #lazy_builder is a string. This is not always a case and in Drupal\Core\Render\Renderer::doRender() we actually allow anything that's callable, ie. strings, arrays, etc.
So now we should either allow arrays in Drupal\Core\Render\PlaceholderGenerator::createPlaceholder() or make Drupal\Core\Render\Renderer::doRender() that it only accepts strings. The latter one can be not easy to achive without breaking BC.
Needs work
10.1 ✨
Last updated
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Can the issue summary be updated please proposed solution. Think it's there but not super clear.