Hi Bhautik,
I was trying to reproduce this issue.
I create a Zigbee network, I used the JN-AN-1216 and followed the steps mentioned before.
1. coordinator formed the network.
2. End Device joined the network.
3. Sleepy End Device also joined the same network.
4. After successfully joined two device then occupancy data report to coordinator continuously.
An end device joins the network without any problem.
So, Did you capture the data that is sending any network?
Are you working with the JN-AN-1189 Coordinator?
Regards,
Mario