Then, when the first trans-Neptunian object (other than Pluto), 15760 Albion, was discovered in 1992, and especially when large numbers of similar objects started turning up, new terms were invented to sidestep the issue: Kuiper-belt object, trans-Neptunian object, scattered-disc object, and so on.
Afterward, when the first object beyond Neptune (excluding Pluto), 15760 Albion, was identified in 1992, and especially when numerous similar objects began to be discovered, new categories were introduced to address the issue: Kuiper-belt object, trans-Neptunian object, scattered-disc object, and others.