Does severance delay my unemployment claim? (St. Louis)

I was offered severance of 9 weeks after being let go as a retail manager and I am unsure how it affects benefits. I have a mortgage and need to plan. Who should I ask before signing?

Rules differ by state. I called the claims line and asked directly, then wrote down the answer and the date.

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.