### 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)

if (error != OK) {
				return nullptr;
			}
			tk = _get_token();
		} else {
			_set_expected_error("[");
			return nullptr;
		}
	}
	ArrayConstructNode *an = alloc_node<ArrayConstructNode>();
	if (tk.type == TK_PARENTHESIS_OPEN || auto_size) { 
		int idx = 0;
		while (true) {
			Node *n = _parse_and_reduce_expression(p_block, p_function_info);
			if (!n) {
				return nullptr;
			}
			
			if (auto_size && idx == 0) {
				type = n->get_datatype();
				if (type == TYPE_STRUCT) {
					struct_name = n->get_datatype_name();
				}
			} else {
				if (!_compare_datatypes(type, struct_name, 0, n->get_datatype(), n->get_datatype_name(), 0)) {
					return nullptr;
				}
			}
			tk = _get_token();
			if (tk.type == TK_COMMA) {