“Fail” is an overloaded word. The new version fails under the previous versions API. That doesn’t mean that there is anything wrong with either old or new rele

“Fail” is an overloaded word. The new version fails under the previous versions API. That doesn’t mean that there is anything wrong with either old or new release or API, just that there are breaking API changes and it should not be considered a drop-in upgrade before properly reading through release notes. There’s no implication of failure. Like you say, it happens.