Google OAuth: Cannot re-login after user deletion (400 general_bad_request)

Hi! I'm facing a bug with Google OAuth in Appwrite.

🧩 Context:
I'm using self-hosted Appwrite 1.6.1 and appwrite: ^15.0.0 (Flutter SDK). I had Google OAuth working properly — I could sign in and create a user via Google in my Flutter app.

Later, I manually deleted that user via Appwrite Console. The user disappeared from the Console UI.

💥 Problem:
Now, when I try to sign in again with the same Google account, I get the following error:
AppwriteException (400 - general_bad_request)

Additionally:

• When I try to create a new user with the same email in the Console, it says the user already exists.
• The user is not listed when I run appwrite users list from the CLI.
• Attempting password recovery with this email gives user not found.

📌 Extra detail (maybe unrelated):
At the same time, my appwrite-worker-deletes container logged this error:
You must set a valid security email address (_APP_EMAIL_CERTIFICATES) to issue a LetsEncrypt SSL certificate.

However:

• _APP_EMAIL_CERTIFICATES is set in my .env
• SSL certificate is active and valid

📦 Setup:

• Appwrite self-hosted: v1.6.1
• Flutter SDK: appwrite: ^15.0.0

🙏 Any idea why this is happening?

Thanks in advance!