### 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 (tk.type == TK_CF_CASE) {
							_set_error(RTR("Cases must be defined before default case."));
							return ERR_PARSE_ERROR;
						} else if (prev_type == TK_CF_DEFAULT) {
							_set_error(RTR("Default case must be defined only once."));
							return ERR_PARSE_ERROR;
						}
					}
					prev_type = tk.type;
					_set_tkpos(pos);
					continue;
				} else {
					HashSet<int> constants;
					for (int i = 0; i < switch_block->statements.size(); i++) { 
						ControlFlowNode *flow = static_cast<ControlFlowNode *>(switch_block->statements[i]);
						if (flow) {
							if (flow->flow_op == FLOW_OP_CASE) {
								if (flow->expressions[0]->type == Node::NODE_TYPE_CONSTANT) {
									ConstantNode *cn = static_cast<ConstantNode *>(flow->expressions[0]);
									if (!cn || cn->values.is_empty()) {
										return ERR_PARSE_ERROR;
									}
									if (constants.has(cn->values[0].sint)) {
										_set_error(vformat(RTR("Duplicated case label: %d."), cn->values[0].sint));
										return ERR_PARSE_ERROR;
									}
									constants.insert(cn->values[0].sint);
								} else if (flow->expressions[0]->type == Node::NODE_TYPE_VARIABLE) {
									VariableNode *vn = static_cast<VariableNode *>(flow->expressions[0]);
									if (!vn) {