Language tag shown in UI although language only provided in other vocab

[acka47]

See https://test.skohub.io/acka47/testing-skohub-vocabs/heads/master/index.de.html

One vocab has language "uk" Hochschulcampus Ressourcentypen not. Nonetheless, "uk" is shown for HCRT:

When I click it no labels are shown at all: