Hi Flak. I believe I’ve located the issue for this. It’s related to the ‘Can Step Up On’ setting that was adjusted in the Ch6 update.
It used to just be a checkbox but now it is a dropdown field with ‘Yes, No and Owner’ as the options. No matter what you select, it will still produce stuttering but it is much worse when ‘Owner’ or ‘No’ is selected. It’s better but not still not perfect when ‘Yes’ is selected.
Sadly a lot of Fortnite SM meshes were defaulted to ‘Owner’ in the update which I think is what’s causing the violent stuttering due to the character trying to step up but not being allowed.
Respawning the player seems to work as a temporary fix.
Sadly the issue returns again within a few minutes.
Hope this helps and praying for a quick resolution on this one as so many maps are unplayable now because of it.