Same issue here, just did a simple one form CRUD app using v0 and Supabase integration.
[SERVER] GoTrueClient@sb-ftszcciuunekkblgatgb-auth-token:1 (2.81.1) 2025-11-17T01:21:51.457Z Multiple GoTrueClient instances detected in the same browser context. It is not an error, but this should be avoided as it may produce undefined behavior when used concurrently under the same storage key.