### Godot version

4.0 Beta10

### System information

Windows 10, Vulkan, GTX1060

### Issue description

`PropertyTweener`'s methods' return value are not discarded and effect the unary operator at next line.

In Editor:
![in_editor](https://user-images.githubusercontent.com/61624558/210715100-04bdf283-7954-4be3-94ca-338987b24c5b.png)


In cpp:
![in_cpp](https://user-images.githubusercontent.com/61624558/210715127-519f6d54-fc15-468f-9aca-ba7d387a5a7b.png)


### Steps to reproduce

Just run the Minimal reproduction project.

### Minimal reproduction project

[Bug Report.zip](https://github.com/godotengine/godot/files/10349829/Bug.Report.zip)

}
		}
		if (is_constant) {
			if (p_assignable->initializer->type == GDScriptParser::Node::ARRAY) {
				const_fold_array(static_cast<GDScriptParser::ArrayNode *>(p_assignable->initializer));
			} else if (p_assignable->initializer->type == GDScriptParser::Node::DICTIONARY) {
				const_fold_dictionary(static_cast<GDScriptParser::DictionaryNode *>(p_assignable->initializer));
			}
			if (!p_assignable->initializer->is_constant) {
				push_error(vformat(R"(Assigned value for %s "%s" isn't a constant expression.)", p_kind, p_assignable->identifier->name), p_assignable->initializer);
			}
		}
		GDScriptParser::DataType initializer_type = p_assignable->initializer->get_datatype();
		if (p_assignable->infer_datatype) {
			if (!initializer_type.is_set() || initializer_type.has_no_type()) {
				push_error(vformat(R"(Cannot infer the type of "%s" %s because the value doesn't have a set type.)", p_assignable->identifier->name, p_kind), p_assignable->initializer);
			} else if (initializer_type.is_variant() && !initializer_type.is_hard_type()) {
				push_error(vformat(R"(Cannot infer the type of "%s" %s because the value is Variant. Use explicit "Variant" type if this is intended.)", p_assignable->identifier->name, p_kind), p_assignable->initializer);
			} else if (initializer_type.kind == GDScriptParser::DataType::BUILTIN && initializer_type.builtin_type == Variant::NIL && !is_constant) {
				push_error(vformat(R"(Cannot infer the type of "%s" %s because the value is "null".)", p_assignable->identifier->name, p_kind), p_assignable->initializer);
			}
		} else {
			if (!initializer_type.is_set()) {
				push_error(vformat(R"(Could not resolve type for %s "%s".)", p_kind, p_assignable->identifier->name), p_assignable->initializer);
			}
		}
		if (!has_specified_type) {
			type = initializer_type;
			if (!type.is_set() || (type.is_hard_type() && type.kind == GDScriptParser::DataType::BUILTIN && type.builtin_type == Variant::NIL && !is_constant)) {
				type.kind = GDScriptParser::DataType::VARIANT;