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CCS/CC2640: Connection fails to CC2640F128 R1 after switching to BLE Stack 4.2

Part Number: CC2640

Tool/software: Code Composer Studio

From my customer:

I'm trying to connect to the device after we switched from 4.1 to 4.2 and it fails. 

It looks like the stack doesn't handle MTU exchange request packet. I attached with the debugger and I don't see the event raised up to the application. 

The application doesn't crash either, it starts advertising after the disconnection.

Have you seen such a issue before, any idea why it happens?

Any help would be appreciated. Please let me know if you more information is needed.

I can send part of the PacketLogger log and the full log if you connect with me directly over email.