Weird issue with CharacterMovementComponent - intense jitter on moving platforms

So, I'm using a standard template first person character and a simple moving platform based on a InterpToMovementComponent. The character rides on the platform as intended, but I get this weird shaking/jitter effect as if the player or the surroundings are violently vibrating. The effect gets stronger with speed and, weirdly enough, the effect varies in strength depending on if im running it in-viewport or in a separate PIE window. It also varies depending on if I'm screencapping it or not. It isn't a fps issue - fps is stable and locked at 60. I tried messing around with tick group order on both actors and physics substepping to no effect whatsoever. I assume its some interaction of the BasedMovement functionality and a non-physics moving platform, but I cannot figure out what it is.
Here's a screencap of the effect:
https://youtu.be/_58jfbhQ4Ro?si=TldKcaz_-dcJCYOl