Advanced components as well as compressed fuel tanks were technologies that were recoverd from ruins in VB6 Aurora, so that seems to work correctly in C# Aurora. Now it is some time I played VB6 but I think it was necessary to disassemble them to get the necessary research to show up.
I think you are misunderstanding - The research shows up, that is not the issue, I can happily research them, and their subsequent lines. The issue is making one so you can put it on a ship.
Consider how one designs a part. You hit the button, the component design window opens, and you select the type of part. Those parts are not selectable to design,
at all, they don't exist.
Some further digging suggests they might have been intended to share the same sub window as their basic brethren, they're listed as a SecondPrimaryTech, yet even so, they will not appear in the drop downs.
I can get them to appear, but as the software isn't expecting it, and it like many things is somewhat hard coded behind the scenes, even without actually designing one I can tell there are issues - like their component name doesn't update, it will simply remain as whatever it was last made by another part, or whatever I set it to - because the new entry has a new ID, and the ID doesn't reference a part name template, or something similar happening behind the scenes.
At this point, I'm not sure if its an omitted entry, or a bug preventing their being shown, or a temporary omission like many tooltips were/are for expediency, or if its more permanent.