FW 4.5.2 Breaks Mesh Config Sync Vigor 2765ac

Upgraded from 4.5.1 to 4.5.2 and the config sync to the mesh nodes remains at ongoing forever and never completes, the nodes are a mix of AP903s and AP802. After a few hours frustrated troubleshooting i rolled back to 4.5.1 and everything is working perfectly again and they sync in under 30 seconds.

Seen the same reported on the Eire forum so its clearly a FW issue.

I can confirm this. Vigor 2765 as Root Node, 3 AP960c as Nodes. No CFG SYNC until i downgraded the 2765 from 4.5.2.2 to 4.5.1. The 960c have the latest Firmware 1.4.10
With the downgrade they immediately sync.