[Bullet] KinemeticBody still jitters against gridmap seams with 3.5 RC2 using Bullet

[elvisish]

Godot version

3.5 RC2

System information

Windows 7 64-bit

Issue description

If gravity is applied to a KB while traversing gridmap seams, the body will jitter. It was meant to be fixed with #35780 in 3.5 RC2 but it still persists. Another example of the problem: #35780

Here's how it looks using bullet:

2022-06-01.22-15-12.mp4

And here it correctly works using GP:

2022-06-01.22-31-47.mp4

Steps to reproduce

• Add a KinemeticBody with gravity in the move_and_slide velocity
• Set physics to bullet
• Watch jitters on seams

Minimal reproduction project

jittertest.zip

[timothyqiu]

Also reproducible in 3.5.rc3.