### 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)

return ERR_PARSE_ERROR;
									}
									ConstantNode::Value v;
									_find_identifier(p_block, false, p_function_info, vn->name, nullptr, nullptr, nullptr, nullptr, nullptr, &v);
									if (constants.has(v.sint)) {
										_set_error(vformat(RTR("Duplicated case label: %d."), v.sint));
										return ERR_PARSE_ERROR;
									}
									constants.insert(v.sint);
								}
							} else if (flow->flow_op == FLOW_OP_DEFAULT) {
								continue;
							} else {
								return ERR_PARSE_ERROR;
							}
						} else {
							return ERR_PARSE_ERROR;
						}
					}
					break;
				}
			}
		} else if (tk.type == TK_CF_CASE) {
			
			if (p_block && p_block->block_type == BlockNode::BLOCK_TYPE_CASE) {
				_set_tkpos(pos);
				return OK;
			}
			if (!p_block || (p_block->block_type != BlockNode::BLOCK_TYPE_SWITCH)) {
				_set_error(vformat(RTR("'%s' must be placed within a '%s' block."), "case", "switch"));