Render 3D Transparent Pass takes 80+ ms for a simple empty scene + cube

[z4gon]

Tested versions

Godot Engine v4.3.rc2.official.3978628c6 - https://godotengine.org

System information

OpenGL API 4.1 Metal - 88 - Compatibility - Using Device: Apple - Apple M1 Pro

Issue description

The profiler shows a spike in frame time, with Render 3D Transparent Pass taking 80+ ms.

I attached a MRP with an empty scene that instantiates a cube when you click with the left mouse button.

The cube is just a MeshInstance3D with a StandardMaterial3D.
It has Transparency = Alpha, and an AnimationPlayer with an animation that pulses the color changing the alpha.

The curious thing is that it only happens in a single frame, after that, the frame time is fine for all the frames.

Steps to reproduce

1. unzip the MRP
2. open in godot
3. click the play button
4. start the visual profiler
5. go to the game and click with the left mouse button inside the window
6. observe the cube being instantiated
7. observe the spike in frame time in the profiler

Minimal reproduction project (MRP)

render-3d-transparent-pass.zip