Thanks @hillary
From what I’m seeing the recommended way to deal with this is a “post-redirect-get” flow. Where the post gets handled and redirected to a get. I’ve tried finding some guides/tips in the Netlify documentation, but am not seeing any.
The implementation I had used was directly from the documentation (Forms setup | Netlify Docs, specifically the success messages section). Is there something missing from the documentation about how to resolve this behavior?