### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

case OP_ASSIGN_ADD:
					priority = 16;
					break;
				case OP_ASSIGN_SUB:
					priority = 16;
					break;
				case OP_ASSIGN_MUL:
					priority = 16;
					break;
				case OP_ASSIGN_DIV:
					priority = 16;
					break;
				case OP_ASSIGN_MOD:
					priority = 16;
					break;
				case OP_ASSIGN_SHIFT_LEFT:
					priority = 16;
					break;
				case OP_ASSIGN_SHIFT_RIGHT:
					priority = 16;
					break;
				case OP_ASSIGN_BIT_AND:
					priority = 16;
					break;
				case OP_ASSIGN_BIT_OR:
					priority = 16;
					break;
				case OP_ASSIGN_BIT_XOR:
					priority = 16;
					break;