Google warning - Deceptive site ahead on OAuth2 authorization code grant flow

Question

We have implemented OAuth2 and using the authorization code grant flow. Some users get the red screen of google which says deceptive ahead.

On request number 5 sometimes users receive the deceptive site ahead warning. In the google search console I have no information regarding it and I can just report it as false flag. Then google flags it as solved but few days later it's back. In the google search console i have 0 information whats up

I think the issue is that google think this code parameter here is malicious code, it always happens on that particular call.

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

Does anybody have an idea how to deal with this issues?

1. 302 https://auth.myapp.com/
2. 302 https://login.myapp.com/login?identifier=demo2
3. 302 https://auth.myapp.com/consent?code_challenge_method=S256&state=a2f1dc186493cfec4c01d8956f1b851c&scope=&response_type=code&approval_prompt=auto&redirect_uri=https://login.myapp.com/connect/kauth/check?identifier%3Ddemo2&client_id=myapp
4. 302 https://auth.myapp.com/authorize?code_challenge_method=S256&state=a2f1dc1864adscfec4c01d8956f1b851c&scope=&response_type=code&approval_prompt=auto&redirect_uri=https://login.myapp.com/connect/kauth/check?identifier%3Ddemo2&client_id=myapp
5. 302 https://login.myapp.com/connect/kauth/check?identifier=demo2&code=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&state=a2f1dc186493cfec4c01d8956f1b851c