Upon switching to any avatar, be it sdk 3.0, 2.0, self uploaded or VRChat official. Stepping on an inclined surface or positioning ones self over a ledge causes the avatar to start hopping in place continuously. Observing the debug menu shows the Grounded parameter rapidly jittering from True to False along with the VelocityY Value as well as VelocityMagnitude with the Locomotion layer state shifting from "Stand" to "Walking" (or their respective names on other avatars) repeatedly. I've experienced this quirk for a little over a year now and it can be reproduced in any world.

This seems to be an issue specifically affecting me, as none of my friends are able to replicate it. Posting as a bug in the hopes anyone else is encountering this problem.