Hello!
The CRS326 is run with RouterOS 6.47.8. I could not use the QSFP+ ports with the Mikrotik Q+BC0003-S+ breakout cable or other QSFP breakout cable. There was always a link missing on one side. With Intel cards the cards did not have any link. Connecting two Mikrotik Switches the 10G side had Link but not the 40G side.
It all started to work as soon as I turned of auto negotiation on first qsfpplus interface. Yes the other 3 ports belonging to that port did start to work when first port was not doing auto negotiation. Now I set all ports to no auto negotiation and 10Gbps full duplex.
This seems to be a bug to me or is there something I do not understand and it works as intended?