We solved it by updating
"@slicemachine/adapter-nuxt": "^0.3.54",
"slice-machine-ui": "^2.10.4",
to
"@slicemachine/adapter-nuxt": "^0.3.61",
"slice-machine-ui": "^2.11.1",
It seems like we have to update every link field now and check the option "Allow target blank" again. Shouldn't be this backwards compatible?