Issue with notifications after update to build ver. 7186

Issue with notifications after update to build ver. 7186

Hello Team,
I noticed that there is an issue in notifications in Workflow Assigning Rules when I use %username% variable. In the message there is only "-" (minus), before the update to build 7186 there was a user name (samAccountname) of created user in my case.
I removed this variable from notification and added again but no success.
How can it be fixed?
Regards,
Maciek.
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