Kinematic body does not move when exactly in between two static bodies

[Zylann]

Godot 3.1 alpha 1
Godot 3.0.6

As reported in this Q&A post: https://godotengine.org/qa/34661/how-can-i-simulate-no-friction-in-a-kinematic-body-2d

If I exactly place a box Kinematic Body 2D aligned horizontally between two static boxes (using pixel and grid snapping), that body will not be able to move vertically with move_and_slide.
If I take out one of the static boxes, it can move.
Under the same situation, a rigidbody is able to move, but the kinematic one isn't.

Example project:
KinematicBoxBetweenTwoOthers.zip

[KoBeWi]

Similar topic: https://www.reddit.com/r/godot/comments/98fh6v/kinematicbody_is_not_able_to_slide_between_two/
Not sure about the Rigidbody, but KinematicBodies have safe margins and they are the cause of this "issue".

[Zylann]

I thought about safe margins too, but there is no way of removing them, they are clamped above zero.