BitBucket 4 with LDAP integration does not add new users into "Default Group Memberships" group anymore

We had been using Stash for a long time with LDAP integration. Everything was good.
Where a user authenticated with LDAP (AD) credentials Stash added it into "stash-users" group specified in "Default Group Memberships" field of LDAP Settings (LDAP Permissions section).
This group has Global Permission "Bitbucket User".
So any user authenticated via LDAP could use Stash. It was nice.

Now we have migrated onto Bitbucket 4.2 and this doesn't work anymore: a user authenticated but isn't added into the group. So he/she sees "You do not have permission to access Bitbucket" error. We have manually add him/her into that group.
Needless to say how troublesome it is.