Uplink confirmation - Issue?

[JindrichHavel]

Our end node sends periodically messages after successful join. All (confirmed and unconfirmed) are sent with a confirmation request. It's OK.
BUT: After receiving the downlink message, it should send unconfirmed messages without a confirmation request. In our app it still sends unconfirmed messages asking for confirmation!?!

We use Chirpstack and downlink message has MacCtx.McpsIndication.RxSlot=RX_SLOT_WIN_CLASS_C and it is not in that part of the condition in code:

LoRaMac.c:

            // Reset ADR ACK Counter only, when RX1 or RX2 slot
            if( ( MacCtx.McpsIndication.RxSlot == RX_SLOT_WIN_1 ) ||
                ( MacCtx.McpsIndication.RxSlot == RX_SLOT_WIN_2 ) )
            {
                Nvm.MacGroup1.AdrAckCounter = 0;
                Nvm.MacGroup2.DownlinkReceived = true;
            }

The Nvm.MacGroup2.DownlinkReceived value is always false!