I only mentioned this because while running your test I wasn’t able to reproduce any jumpy or twitchy movement upon landing. Could you provide a short video showing the issue if possible?
I did notice twitchy movement while in the air though. However, upon landing the character slid smoothly to a stop. I just want to make sure we are experiencing the same thing so that I can create a bug report if needed.
Also note, if changing the Breaking Friction Factor does help for this specific situation you can just dynamically change it during run time when needed. For example if the character jumps while on this moving platform set friction to be higher and after landing (maybe with a slight delay) set the friction back to what you need.
This may be a legitimate bug so I would like to investigate further if possible.