Area3D does not see newly instanced StaticBody3D with Monitoring/Monitorable enabled

[cridenour]

Godot version

4.0.beta1

System information

Windows 10

Issue description

I'm aware of #17238 (specific to Monitorable being enabled, which doesn't help here) and #57539 which is specific to moving a StaticBody. Could be the same fix works for this and #57539 but I did not want to miss this use-case.

When you have a Area3D and a new StaticBody3D is placed in the scene, it will not detect it until you change the collision_layer or collision_mask. I imagine other "touches" will force an update as well.

Steps to reproduce

1. Create a scene with an Area3D.
2. After scene is ready, add a StaticBody3D with the layer of the Area3D's mask.

Optional workaround: 3. After more time, update the collision_layer or collision_mask.

Minimal reproduction project

Area3D StaticBody.zip

This MRP automates showing the bug and the current workaround.

[Brandtweary]

I'm having this exact same bug in 2D. I'm using Godot version 4.0.beta4, on Windows 11.

[jsardev]

Same issue with Area2D and StaticBody2D, Godot 4.0.2.stable, MacOS.

[RawEnchilada]

Area2D doesn't emit mouse_entered event as well if instantiated from script. Linux v4.0.3.stable.mono.official

[Razboinicul]

Same issue with v4.1.1.stable.official [bd6af8e0e], Linux

[Denatle]

Same with Area2d, 4.2.stable, windows 11