Unable to set light energy via RenderingServer (light.get_base() returns RID(0))

### Tested versions

Godot v4.6.dev3
Godot v4.5.1.stable

### System information

Windows 11 (build 26100) - Multi-window, 1 monitor - Vulkan (Forward+) - integrated Intel(R) Iris(R) Xe Graphics (Intel Corporation; 32.0.101.7076) - 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz (8 threads) - 15.80 GiB memory

### Issue description

I'm implementing a light flicker as a tool script.
`Light3D.set_param(param, value)` works, but it changes the base light energy in the Inspector.

So I'm trying to change the light energy using `RenderingServer.light_set_param(light.get_instance(), param, value)`
However, it returns an error saying the light is null:
`ERROR: servers/rendering/renderer_rd/storage_rd/light_storage.cpp:190 - Parameter "light" is null.`

Reading the RenderingServer docs:

So, from what I understand:

- `VisualInstance3D.get_instance()` returns an instance (the Light3D?)
- `VisualInstance3D.get_base()` returns a base (the actual light type?)

However, calling `RenderingServer.light_set_param(light.get_base(), param, value)`
still results in:
`ERROR: servers/rendering/renderer_rd/storage_rd/light_storage.cpp:190 - Parameter "light" is null.`

`light.get_base()` returns `RID(0)`

### Steps to reproduce

`RenderingServer.light_set_param(light.get_instance(), RenderingServer.LIGHT_PARAM_ENERGY, 1.0)`
or
`RenderingServer.light_set_param(light.get_base(), RenderingServer.LIGHT_PARAM_ENERGY, 1.0)`

### Minimal reproduction project (MRP)

[light-set-param-mrp.zip](https://github.com/user-attachments/files/23445184/light-set-param-mrp.zip)

Start with the linked light-set-param-mrp.zip and reproduce both RenderingServer.light_set_param calls using Light3D.get_instance() and get_base(). Read the Light3D, VisualInstance3D, and RenderingServer API documentation, then trace the null RID reported at servers/rendering/renderer_rd/storage_rd/light_storage.cpp:190. Done means identifying the valid RID or correcting the API behavior so light energy can be changed without the null-light error.

Written by the indexing model from the issue text.