Is this no longer a problem, and someone just forgot to close the issue, or is it now uncommon enough to keep it low priority?

In T5639#155478, @werner wrote:

echo BYE | dirmngr -vv --server 2>certs.log

Lists all certificates

@bernard - well, that's the kicker, isn't it.

Hello.
@bernard has been so kind to try and help me with this exact issue over in the gpg4win forum, and it seems I'm not the only one who still has problems with the "broken" LE certificate chain and hkps://keyserver.ubuntu.com.