There's a piece missing in the NA28 apparatus. Note that one of the most exciting new features of L10, the Factbook tags, show up for the various ancient NT texts in the NA28 Critical Apparatus-

In the example, I've hovered over the 'B' and the FB tag shows up with information, including the primary identifier of the 'B'...Codex Vaticanus.
But note there are no FB tags for one of the most important codices, Sinaiticus-

Thus, hovering over the aleph gives no useful information at all, as the FB isn't being queried. (Bummer!)
Just for reference, Codex Sinaiticus is tagged in other apparati (here's an example from the GNT apparatus) showing the hover producing the FB tag info popup-

Can we get this fixed in the NA28 apparatus?