HCM Extract: No Output when Fast formula is added to Extract

Hi Team,

I need to get the Assignment Effective Start Date based on some conditions using a Fast Formula. My fast formula is working fine because I wrote logs for each field and can see the value in the logs.

But extract Output is empty. When I remove the FF field from the extract, everything works fine, but when I add it, no output other than parameters.

Can anyone please suggest how to solve this issue.

Thanks,

Chaitra