This release was in RC mode for three weeks. All errors reported during that phase I fixed. I didn't get reports on cancelling problems and I didn't see any myself during testing against the hardware and firmware that I have access to. If people are now running into errors I'd say, maybe take that as a hint to participate in RC testing, apparently your specific hardware/firmware combination isn't represented enough yet.
Always expecting others to magically weed out bugs that don't reproduce for them is a recipe for problems like this. Participate, don't just consume.
Finally, something specifically for you, @Will_N. I've been doing this project for over five years now, four of those full time. It has completely taken over my life. I pour everything that I have into it, just hoping that enough in donations and Patreon subscriptions comes back that I can afford to continue to do that. There are definitely other models of work that would be less risky, less complicated, more healthy and less stressful. So the next time you think telling someone "Shame on you" who works their ass off so that others may have an open source tool to control their 3d printers is a good idea, maybe take a moment to think about how entitled you are coming off when doing that and how such words might be affecting the motivation of open source maintainers to keep on maintaining.