I'm not sure if this a bug in RouterOS or something on the bell side causing the issue.
Or possibly I have something configured wrong... (Mikrotik noob)
I have a work around, but I wasn't sure if I'm the only one.
I have a CCR2004-16G-2S+, with a bell sfp module it's not the Huawei.
When I have the sync speed set to 2.5g (this sfp is 2.5g) it will not connect, no link
however if I set it at 1g let it connect, then set it at 2.5g it works.
I have a script set at bootup to set the speed to 1g wait 3 mins then set the speed to 2.5g