### 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 p_node;
			}
		}
		if (values.size() == 1) {
			if (type >= TYPE_MAT2 && type <= TYPE_MAT4) {
				ConstantNode::Value value = values[0];
				ConstantNode::Value zero;
				zero.real = 0.0f;
				int size = 2 + (type - TYPE_MAT2);
				values.clear();
				for (int i = 0; i < size; i++) {
					for (int j = 0; j < size; j++) {
						values.push_back(i == j ? value : zero);
					}
				}
			} else {
				ConstantNode::Value value = values[0];
				for (int i = 1; i < cardinality; i++) {
					values.push_back(value);
				}
			}
		} else if (values.size() != cardinality) {
			ERR_PRINT("Failed to reduce expression, values and cardinality mismatch.");
			return p_node;
		}
		ConstantNode *cn = alloc_node<ConstantNode>();
		cn->datatype = op->get_datatype();
		cn->values = values;
		return cn;
	} else if (op->op == OP_NEGATE) {