Wireless mesh bridge mode on leaf FortiAP ethernet is getting 169.254.x.x issue.

The leaf FortiAP's Ethernet is always getting 169.254.x.x IP from root mesh FortiAP issue.
Solution:
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Logon to Fortigate -> Network -> Interfaces -> Root FortiAP's assign interface -> Edit
Changed the "Addressing mode" from "Dedicated to FortiAP" to "Manual".
The DHCP Server section will came up. Input the DHCP address Range manually.
Note: 192.168.8.1/24 meaning range is from 192.168.8.101 to 192.168.8.254.