The Custom Side Vector facing mode is no different than the Custom facing mode on Niagara ribbons. The linked UDN has more information on a potential cause, as well as a proposed fix. It looks like in FNiagaraRendererRibbons::SetupMeshBatchAndCollectorResourceForView the vertex factory's facing mode is used before is set. 

Steps to Reproduce
  1. Create a Niagara system based off the static beam template
  2. Disable the Beam Width Module
  3. In particle spawn set the ribbon width to 10
  4. In the particle spawn set the ribbon facing vector to 0.0, 0.0, 1.0
  5. Set the facing mode in the renderer to Custom
  6. Set the facing mode to Custom Side Vector


The ribbon is facing the same direction with both facing modes. 

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ComponentUE - Niagara
Affects Versions4.24
Target Fix4.25
Fix Commit11969357
Main Commit11970125
Release Commit11969357
CreatedFeb 28, 2020
ResolvedMar 5, 2020
UpdatedJul 30, 2020