There's a duplicate in TNG:

Beverly Crusher & Deanna Troi
Deanna Troi & Beverly Crusher

Also several Disney-related pairings seem to have crept in over with Descendants:

Adam/Belle (Disney)
Beast/Belle (Disney)
Beast/Belle/Gaston (Disney)
Beast/Gaston (Disney)

The top 2 pairings do appear in Descendants, so they could be in there?

Cassandra/Eugene Fitzherbert | Flynn Rider/Rapunzel Cassandra/Eugene Fitzherbert | Flynn Rider/Rapunzel/Varian Cassandra/Rapunzel (Disney: Tangled)
Eugene Fitzherbert | Flynn Rider/Rapunzel
Rapunzel/Varian (Disney)

Tangled hasn't shown up in Descendants yet.

Fa Mulan/Li Shang

Neither of these two is actually shown in Descendants.

They are all in the correct fandom but they're like extras over in Descendants.