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nRF Mesh App stops workings after IV update

Hello,

I'm experiencing an issue with talking to our mesh server after an IV update occurs. After a fresh provisioning the unit talks fine, however, one of our units has an IV index set to 56 and when the server gets the secure beacon, the IV index updates and the app stops being able to refresh TTL/get composition data. 

I believe it to be a sequence number issue as we've looked at the debug messages of a flutter example app and we do notice the IV updates there as well (but same lockup issue).

The unit setting the IV index was set to 56 via a "hacked" call to try to recover sealed units (LPN friend nodes). As friends they're able to establish a friendship with the server, however, no messages are able to be sent or received via the mesh to them. 

Thanks

Alex 

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