Vercel Integration Preview Deployment not using Neon Branches in environment variables

When connecting the project, I set it to create neon branches for preview deployments. When creating git branches and pushing them, Vercel deploys them, but just uses the production / main neon environment variables. This is evidenced in the environment variable settings in the Vercel Dashboard as well as when doing "vercel env pull" for preview and the specific branch. When I check the Neon console, it shows the branches though.
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