### 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)

return OK;
		} break;
		case COMPLETION_CALL_ARGUMENTS: {
			StringName block_function;
			BlockNode *block = completion_block;
			while (block) {
				if (block->parent_function) {
					block_function = block->parent_function->name;
				}
				block = block->parent_block;
			}
			for (int i = 0; i < shader->functions.size(); i++) {
				if (!shader->functions[i].callable) {
					continue;
				}
				if (shader->functions[i].name == completion_function) {
					String calltip;
					calltip += get_datatype_name(shader->functions[i].function->return_type);
					if (shader->functions[i].function->return_array_size > 0) {
						calltip += "[";
						calltip += itos(shader->functions[i].function->return_array_size);
						calltip += "]";
					}
					calltip += " ";
					calltip += shader->functions[i].name;
					calltip += "(";
					for (int j = 0; j < shader->functions[i].function->arguments.size(); j++) {
						if (j > 0) {
							calltip += ", ";
						} else {