Just letting you know, after updating my rb5009 from 7.7 to 7.8beta3 there was no link detected on my Huawei MA5671A ONT.
Reverted back to 7.7 and everything works perfectly fine again.
Not sure if this might be SUP-105042 (on which I could not find any more Information on) but it was also mentioned with sfp issues.
Feel free to contact me if I can help with anything.
Thanks!