Is it a matter of configuration to get the multibranch source using Helix Swarm to populate jobs using perforce streams?
When the Jenkins Helix Swarm source syncs a stream, it syncs it as if it was a classic branch, ignoring the stream view (import, etc..). Only the non-imported files are synced.
I ran into a similar result when I accidentally tried using the Helix Branches source with a stream path. I discovered I needed to add a Helix Streams source instead. It seems like Helix Swarm sources similarly only support classic depot branches?