If you opt-in to using a beta release some bugs are to be expected; if you wish to avoid that risk you should use stable releases, that's what they're for.
The fact that the changelog shows that a bug was fixed does not guarantee you will not encounter a similar bug or perhaps even the same bug if different circumstances.
It's not "blaming users for being frustrated", it's explaining a simple reality of software development. If you choose to use a beta product you may experience bugs; it's understandable that this can sometimes be frustrating, but it isn't really valid to be as angry as you seem to be with the developers -- you have the option of sticking to stable releases to have a much better chance of avoiding problems, and if you encounter serious problems in a stable release then some level of anger may be more understandable.
Given you opted in to beta releases and have experienced this error, have you submitted a high-quality bug report to help the developers solve the problem for you?