LDAP Decision Node returns incorrect user attribute to search for in user store

Bug description

When using LDAP Decision Node incorrect search attribute is passed down to user store which results in User not found after successful authentication.

How to reproduce the issue

Preconditions:

• Vanilla AM 6.5 with embedded DS as user repo.
• Default Identity Store configuration

1. add email address to the sample demo user
2. create a tree with LDAP Decision node

3. Properties of the Node:

3. Use the tree. Sign in using email of demo user. 

NOTE:

This was working fine in AM 6.5 M9.