RB 493ah 10Meg Rates

I have found an issue with RB 493 using a 10Meg device with it when setting up its port as a slave port. I setup a RB 493 and have internet connection on port 1 of the router. Ports 2 is the master port and ports 3-9 are slave to port 2. When I plug in just my 100M devices I am able to do a bandwidth test and get 97M of data to anything I plug into it. Soon as I plug in a 10M device my bandwidth goes to 50k-6M and anywhere in-between. This is sending traffic from the RB 493 to another device. Other devices sending traffic to the RB 493 works normally. It only affects traffic going the one way. RB 493 → anything. I have tried firmwares.

4.11
4.16
5.0rc7
5.orc9

They all have the same affect. If I remove the slave ports and create a bridge in the RB 493 and then bridge ports 2-9 everything works even with the 10M device plugged in. I can get 97M of data to everything with no problems. I have tried this on a RB 1100 and RB 750 and neither of these have problems even with it setup to master and slave ports. This only happens on RB 493.

Just looking to see if anyone else has had any issues with this and to see if there is a fix. We can use the bridging option but would like to have setup as slave ports if possible.

Ben

How long cable are you using? Does 10M device support auto-negotiation and full-duplex transmission?