Destination structure option disabled to Image roots

Hey there, I have encountered a problem after migrating my website to a new server. In Webp Express config, I can’t choose the value Document root for the destination structure parameter. This causes the images not to display because the path is not the right one. Is there a known reason why this parameter would be disabled and set by default to Image roots?

I’m using nginx both before and after migration.

Thanks for your help