asterisk users - Nov 2013 - Channel not releasing immediately for Attended Transfer

I have a situation where Asterisk is not releasing the channel for Attended
transfer immediately once I transferred and hangup from my side. The call
is still ongoing and disconnecting after the third party disconnected.

I see that its bug in the Asterisk, but not sure its fixed in version
11.2.1.

Any one facing this issue?

Regards.
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