amplify lambda environment variables issue, added, removed and now push doesn't work

Question

I
- added an env variable with `amplify function update`.
- then removed it with the same command 
- the functions folder is practically the same as in in the #current-cloud-backend

and yet I am getting error that there is no [env] in template
```
🛑 Resource is not in the state stackUpdateComplete
Name: function...DefineAuthChallenge (AWS::CloudFormation::Stack), Event Type: update, Reason: Parameters: [env] do not exist in the template, IsCustomResource: false
```

I checked and ensured that the function template does contain the corresponding Parameter.. 
Just in case I even tried to remove the parameter and push again - it is still stuck on this error

I guess it may be related to the latest amplify upgrade - current amplify version is 12.5.1

Answer

Not sure what the original issue was, but here are the steps that resolved the problem for me
- I deleted the functions with `amplify update auth` (the function were auto generated as Cognito triggers so auth depends and control them)
- `amplify push` to successfully deploy the deletion
- `amplify update auth` and select through walk-through the needed triggers
- `amplify function update` to add back the environment variables - although in my case I added a resource permissions which in case automatically added env variable with the DynamoDB table names, so I no longer needed my previous environment variables
- `amplify push` now successfully pushed the functions with

amplify lambda environment variables issue, added, removed and now push doesn't work

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