Adding additional sign-up/sign-in redirect URIs using `amplify update auth` removes env vars from unrelated PreSignUp lambda function

[floriankrueper]

How did you install the Amplify CLI?

npm

If applicable, what version of Node.js are you using?

v21.6.1

Amplify CLI Version

12.10.1

What operating system are you using?

MacOS 14.2.1 (23C71)

Did you make any manual changes to the cloud resources managed by Amplify? Please describe the changes made.

Configured WAF rules and logging for Appsync

Describe the bug

Adding additional sign-up / sign in URI removes env vars from unrelated PreSignUp function

Expected behavior

Only update the sign-in / sign-out URIs
Do not make updates to unrelated functions

Reproduction steps

1. Setup an environment that uses Auth configured with Google and a custom PreSignup function
2. Configure a custom env var for PreSignup function
3. Use amplify update auth to add two additional sign-in/sign-out URIs.
4. amplify status shows changes to Auth module as expected but also to Function module for the xxxPreSignUp function which is unexpected.
5. Investigation shows that custom env var for xxxPreSignUp has been removed from:

• amplify/backend/function/xxxPreSignup/xxxPreSignup-cloudformation-template.json
• amplify/backend/function/xxxPreSignup/function-parameters.json
• amplify/backend/backend-config.json

Project Identifier

682e0d66e3a50d4839b5c4d402d6addf

Log output

Details

# Put your logs below this line

Additional information

No response

Before submitting, please confirm:

• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.
• I have removed any sensitive information from my code snippets and submission.

[ykethan]

Hey @floriankrueper, thank you for reaching out. I was able to reproduce the issue using the following reproduction steps.

1. amplify add auth and amplify update auth to add oauth and triggers.
2. amplify update function, add environment variable
   observed the team-provider-info.json and backend-config.json added the env variable
3. amplify update auth -> walkthrough all
4. go through the flow without any changes
   Observe the environment variable is removed.

Marking as bug.