To reproduce:

1. Make sure that you have the Vector 2022 skin enabled in the French Wikipedia.
2. Go to https://fr.wikipedia.org/wiki/Flevoland
3. Click the language selector at the top of the page. Make sure that the new Vue language selector appears.
4. Search for nds.
   1. Observed: "Plattdüütsch" appears. "Nedersaksies" doesn't appear. (Bad. Both should appear.)
5. Search for neder.
   1. Observed: "Nederlands", "Nedersaksies", and "Plattdüütsch" appear. (Good, must be preserved.)