I'm trying to use username/password credentials with git in a pipeline like this:

pipeline {
  agent any
  stages {
    stage('Example') {
      steps {
        git credentialsId: 'git-creds', url:'https://github.com/jenkinsci/aws-secrets-manager-credentials-provider-plugin.git'
      }
    }
  }
}

The Git plugin will first test if the credentials are a ssh key, and then try to extract the key. Only if the credentials are not a ssh key will it test if it is a username/password.

The issue is that 'AwsCredentials' are implementing both 'StandardUsernamePasswordCredentials' and 'SSHUserPrivateKey'.

The solution would be (I think) to have different subclasses for each.