The fast-moving ribbon particle trail looks different on the server and client.
It looks as though the client was drawing the previous frame.
Client can see the long trail effect more than server.
Server and Client can see the same trail effects.
Repro is to move static mesh with attached trail particle at high speed. The server synchronizes movement coordinates and synchronizes location with client with RepNotify.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-74874 in the post.