What problem does this address?

The details block is currently lacking support for its name attribute.

Spec.:
https://html.spec.whatwg.org/multipage/interactive-elements.html

The attribute is supported in all recent browsers (except Firefox, god knows why...):
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details

While the "accordion-like" functionality supplied by the attribute might be misleading, the details block should still aim to support all HTML attributes defined in the spec, see also #21584 (comment)_.

What is your proposed solution?

Add the "name" attribute to the block settings.