Resolved Strange Trail Renderer behavior

Hey folks!

I have a simple debugging scene for previewing data. In the scene view it looks fine. However, in the game view, my trail renderer is getting all kinds of blurry/elongated/artifacts strangeness. Any idea what might be causing this?

Default HDRP settings, many post-processing steps turned off (including motion blur). Material is HDRP unlit (lit also showed issues).

XR is enabled in the project, but I disabled it for the scene camera, no change still. Anti-aliasing doesn't seem to be making a difference, though the last time I changed that setting Unity crashed.

 

Found it. Motion Vectors for the Trail Renderer. Changed that to Camera Motion Only, and it looks WAY better.