Thanks for the additional context! This sounds like a different bug than the one above. Can you share your file with us, so our team can take a closer look?
If so, please include a URL link to the file to this topic thread, and share edit access with support-share@figma.com.
Our team confirmed that blur values aren’t available to view only dev mode users, but thanks again for flagging this! We’ve moved your replies to their own feature request.
Our dev mode team will take this capability into consideration for the future.