### 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)

int max = builtin_func_const_args[constarg_idx].max;
								bool error = false;
								if (p_func->arguments[arg]->type == Node::NODE_TYPE_VARIABLE) {
									const VariableNode *vn = static_cast<VariableNode *>(p_func->arguments[arg]);
									bool is_const = false;
									ConstantNode::Value value;
									value.sint = -1;
									_find_identifier(p_block, false, p_function_info, vn->name, nullptr, nullptr, &is_const, nullptr, nullptr, &value);
									if (!is_const || value.sint < min || value.sint > max) {
										error = true;
									}
								} else {
									if (p_func->arguments[arg]->type == Node::NODE_TYPE_CONSTANT) {
										const ConstantNode *cn = static_cast<ConstantNode *>(p_func->arguments[arg]);
										if (cn->get_datatype() == TYPE_INT && cn->values.size() == 1) {
											int value = cn->values[0].sint;
											if (value < min || value > max) {
												error = true;
											}
										} else {
											error = true;
										}
									} else {
										error = true;
									}
								}
								if (error) {
									_set_error(vformat(RTR("Expected integer constant within [%d..%d] range."), min, max));
									return false;
								}