It's a pad of sticky notes!
First, wrong forum. This belongs in the Eclipse's Rules forum.
Secondly, the Wormhole Technology doesn't allow forming Diplomatic Relations through a half-wormhole.
Rulebook, page 11 wrote:
If one of the hexes where you have an Influence Disc gets connected through a Wormhole to a hex where another player has a Disc, you and the other player may agree on forming Diplomatic relations with each other.
Rulebook, page 31 wrote:
You may Explore, Influence and Move through a hex edge that has a Wormhole on just one side.
Notice that the Diplomatic Relations rules only reference Influence Discs, and the Wormhole Generator specifically lists things that it effects.
Hope this helps