### 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)

expr = func;
				} else { 
					if (p_block == nullptr) { 
						if (is_const_decl) {
							_set_error(RTR("Expected constant expression."));
						}
						return nullptr;
					}
					const StringName &name = identifier;
					OperatorNode *func = alloc_node<OperatorNode>();
					func->op = OP_CALL;
					VariableNode *funcname = alloc_node<VariableNode>();
					funcname->name = name;
					func->arguments.push_back(funcname);
					int carg = -1;
					bool ok = _parse_function_arguments(p_block, p_function_info, func, &carg);
					
					ShaderLanguage::BlockNode *bnode = p_block;
					while (bnode) {
						if (bnode->variables.has(name)) {
							_set_error(RTR("Expected a function name."));
							return nullptr;
						}
						bnode = bnode->parent_block;
					}
					
					int function_index = -1;
					for (int i = 0; i < shader->functions.size(); i++) {
						if (shader->functions[i].name == name) {