[Bug] The keyword filter for events is broken

Once events are enabled in the API (!19 (closed)) the keywords filters for the result page of events is displayed right, but upon selecting a filter, no results are shown.

try out https://search.unhide.helmholtz-metadaten.de/results/trainings

It might be that this is already not an issue with the newer front end in typescript, but it needs to be checked. @gabriel.preuss could you check if this is also the case for the current dev version of the next.js UI verison?