### 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 (array_size > 0) {
					prepos = _get_tkpos();
					tk = _get_token();
					if (tk.type == TK_OP_ASSIGN) {
						if (is_const) {
							_set_error(RTR("Constants cannot be modified."));
							return nullptr;
						}
						assign_expression = _parse_array_constructor(p_block, p_function_info, data_type, struct_name, array_size);
						if (!assign_expression) {
							return nullptr;
						}
					} else if (tk.type == TK_PERIOD) {
						completion_class = TAG_ARRAY;
						if (p_block != nullptr) {
							p_block->block_tag = SubClassTag::TAG_ARRAY;
						}
						call_expression = _parse_and_reduce_expression(p_block, p_function_info);
						if (p_block != nullptr) {
							p_block->block_tag = SubClassTag::TAG_GLOBAL;
						}
						if (!call_expression) {
							return nullptr;
						}
					} else if (tk.type == TK_BRACKET_OPEN) { 
						index_expression = _parse_and_reduce_expression(p_block, p_function_info);
						if (!index_expression) {
							return nullptr;
						}
						if (index_expression->get_array_size() != 0 || (index_expression->get_datatype() != TYPE_INT && index_expression->get_datatype() != TYPE_UINT)) {