### 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)

} else if (tk.type == TK_PERIOD) {
#ifdef DEBUG_ENABLED
				uint32_t prev_keyword_completion_context = keyword_completion_context;
				keyword_completion_context = CF_UNSPECIFIED;
#endif
				DataType dt = expr->get_datatype();
				String st = expr->get_datatype_name();
				if (!expr->is_indexed() && expr->get_array_size() > 0) {
					completion_class = TAG_ARRAY;
					if (p_block != nullptr) {
						p_block->block_tag = SubClassTag::TAG_ARRAY;
					}
					Node *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;
					}
					expr = call_expression;
					break;
				}
				StringName identifier;
				if (_get_completable_identifier(p_block, dt == TYPE_STRUCT ? COMPLETION_STRUCT : COMPLETION_INDEX, identifier)) {
					if (dt == TYPE_STRUCT) {
						completion_struct = st;
					} else {
						completion_base = dt;
					}
				}