Yes, on all 10,000 or more, probably more, possible combinations of devices and supported operating system versions. And, not only that, thoroughly on each one, with regard to every single aspect of what the system can do. Email, messaging, live view, recording, play back, you name it, every single aspect.
What do you think?
Could you argue that your product is mainstream, and also can’t have that many supported OS versions, so it should have been tested, probably, but then maybe they also have to consider all other apps that are installed. All individual user customisation possibilities, such as screen scaling, special theme selections, customised audio, customised messaging options, and so on.
It’s entirely possible, in fact highly likely, that it was tested on your product, in some depth, and was found to work perfectly. What you and others have found is probably some sort of weird bug that could not be easily foreseen.
There’s an equally likely chance that it falls over because something in Apple messaging does behave as their own specifications describe, and Blink operates as it should, but messaging isn’t doing what it should. Ever wonder why such apps also get frequent updates, which contain a whole long list of bug fixes?
There are bound to be things like this that pop up from time to time, and the only way to deal with them is by bug reports, so that they can look at specific cases in detail. Once they identify the issue, it’s just a matter of time before they roll out a fix, or a workaround, if the fault lies elsewhere.
It would seem Blink is a fairly small team, and things seem to take a long time. Once, even when it was clear they had done something that pretty much screwed everyone over, with a change in the app, it took weeks to roll out a fix. Make of that what you will as to how quickly this issue is likely to be fixed.