Full line rate is not seen testing traffic over an ACX7100-48.  The device is in a lab with 2 ports being exercised, et-0/0/18 and et-0/0/12.  Traffic is sent in a single irection with 2 flows at 100% line rate over each port:

802.1Q traffic (50Gbit/s) uplink -> et-0/0/18 -> et-0/0/12 -> IXIA
802.1Q traffic (50Gbit/s) uplink -> et-0/0/12 -> et-0/0/18 -> IXIA

And, approximately half of the traffic is dropped.  If one flow is used, the issue is not seen.

Configuration:

et-0/0/18
    vlan-tagging
    speed 50g
    unit 0 
        vlan-tags outer 34
        family ethernet-switching 
        vlan 
            members pair_3_4
            
et-0/0/12
    vlan-tagging;
    speed 50g;
    unit 0 
        vlan-tags outer 34
        family ethernet-switching 
        vlan 
            members pair_3_4
 

Transit traffic throughput is not as expected.

To, get optimum throughput, ports should be spread across ACX7100-48L Port Groups:

For the SFP ports, from 0 to 47, 8 ports constitute a group: