Group membership leak after user recreation

Setup:
1) Using crowd (v2.7.1) as external directory (read-write) for jira (v6.1.4).
2) Using the SingleSignOn Connector from seraph-config.xml
3) crowd is connected to OpenLDAP (also r/w)

Steps to reproduce:
1) Delete a user, which has active group memberships, in jira
2) Create a user with the same name in jira

Problem:
1) The "User delete" seems to be correctly synchronized with crowd (at least the user is no longer displayed, haven't looked at the database so far)
2) After the recreation, the former group memberships are "restored" (in crowd and in jira)

May somehow be related to https://jira.atlassian.com/browse/JRA-25611 , however it seems not to be fixed so far.

Kind regards,

Sebastian Lotter