I changed the RunMinification → CacheBuster to Version as I had it on Timestamp, but this doesnt seem to fix my problem. The file is still missing
/sb/umbraco-backoffice-css.css.vd9e028084f407aec7664623657421628f9a1ef35
I am not quite sure whats missing here or what is wrong as it did work on the previous versions. Is there anything else I can provide to narrow down the issue?