Raycast2D can't detect a collision when a moving platform does down quickly.

[fabriceci]

Godot version

v3.4.beta.custom_build [b9ee64a24]

System information

MacOS 11.4

Issue description

Raycast2D can't detect a collision when a moving platform does down quickly.

Steps to reproduce

Run the project.

Minimal reproduction project

raycastBug.zip

[JestemStefan]

I did a few tests and maybe it will help solve the issue.

• When ray is longer then platform speed then it detects collisions correctly.
• When player move in _process() instead of _physics_process() then it detects collisions correctly even with ray of length 35.

[Calinou]

This is yet another physics tunnelling issue, which can be worked around by increasing the ray length based on speed or increasing Physics Fps in the Project Settings.