Unexpected behavior when setting position of KinematicBody2D with Sync to Physics enabled

[v3141]

Godot version:

3.2.3.stable

OS/device including version:

Arch Linux Kernel 5.10.7-arch1-1
OpenGL ES 2.0 Renderer: GeForce RTX 2070 Super/PCIe/SSE2
OpenGL ES 2.0 Batching: ON

Issue description:

Here's a video: https://imgur.com/a/bdltzww
All physics bodies are KinematicBody2D's. When enabling Sync to Physics, setting the position of the platform seems to only work when the entire position is set to a new vector. Setting the position via separate parts (i.e. setting the x position and the y position separately) seems to ignore the x axis.
Simply put: the platforms should all be going in a circle, but the top right ignores setting the X-part of the vector, and simply goes in a straight line.

Steps to reproduce:
I used a parametric equation where the x value of the position of each platform is some multiple of cos(t) and the y value is some multiple of sin(t), where t is continuously increased every frame. You don't need to create the kinematic characters on top of each platform, however, you need to enable Sync to Physics, and set each the x and y parts separately rather than setting the global position of each.

Minimal reproduction project:

https://github.com/etables/godot-unexpected-behavior-minimalist