There are release notes, and they document the parts that are known to have problems.
Maybe you happened to do something that nobody else has done in that order yet? If so, how would they know? The combinatorics of all the feature in this engine are way wider than what can possibly be exhaustively tested even if every human on the planet ran test plans 24/7 for 100 years.
Btw, I’m not so much defending the engine, as trying to teach how I think you have to approach this engine to ship a high quality game on top of it.
If you’re not prepared to take that approach, and make Unreal Engine a lifestyle where you are responsible for what you use and ship, then maybe Unreal Engine isn’t actually the tool for you. Not ever tool is the right fit for every project.