### 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)

_set_expected_error("(");
										return ERR_PARSE_ERROR;
									}
								}
							}
							if (tk.type == TK_PARENTHESIS_OPEN || curly) { 
								while (true) {
									Node *n = _parse_and_reduce_expression(p_block, p_function_info);
									if (!n) {
										return ERR_PARSE_ERROR;
									}
									if (is_const && n->type == Node::NODE_TYPE_OPERATOR && static_cast<OperatorNode *>(n)->op == OP_CALL) {
										_set_error(RTR("Expected a constant expression."));
										return ERR_PARSE_ERROR;
									}
									if (!_compare_datatypes(var.type, struct_name, 0, n->get_datatype(), n->get_datatype_name(), 0)) {
										return ERR_PARSE_ERROR;
									}
									tk = _get_token();
									if (tk.type == TK_COMMA) {
										decl.initializer.push_back(n);
										continue;
									} else if (!curly && tk.type == TK_PARENTHESIS_CLOSE) {
										decl.initializer.push_back(n);
										break;
									} else if (curly && tk.type == TK_CURLY_BRACKET_CLOSE) {
										decl.initializer.push_back(n);
										break;
									} else {
										if (curly) {