Connected Apps shows “Something is wrong with this token” but OAuth works

I’m integrating OAuth2 with Patreon and see “Uh‑oh. Something is wrong with this token” on the Connected Apps page even though the flow works. I’ve tested both confidential (no PKCE, using client_secret) and public (PKCE) configurations. In both cases, the token exchange succeeds and I can call the v2 identity endpoint with the returned access_token. My redirect URI exactly matches my app config: https://aangimation.com/api/auth/patreon/callback