Subdomain cookies error

[avarobinson]

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[REQUIRED] Environment

• Browser version:
• AA SDK version:
• Package:

[REQUIRED] Describe the problem

When clicking a link in one project that redirects to another on a subdomain they get this:
State loaded from storage couldn't be migrated since no migrate function was provided error being thrown when using subdomain cookies.

Example config:

sessionConfig: {
    expirationTimeMs: 2 * 60 * 60 * 1000,
    domain: !process.env.NEXT_PUBLIC_VERCEL_ENV
      ? "localhost" // local development
      : ".merp.io",
  },

How to reproduce:

Relevant code or sample repro: