Kibana 8.4.2 new Control does not show options for runtime field

Hello,

i upgraded to the newest Kibana version to use the new Controls.

I have a runtime field in my Data View that gets a value from the indexname:
image

It can be used in all visualizations without problems. I tried to add a Control for it:
image

But it does not show any options:
image

Is this still an issue with the new Controls?

Best regards
Jonas