I delete intermediate and saved before any time I open the editor and I still run into blueprints blanking all their default properties fairly often. Its really annoying but became the expectation in recent engine versions.
Thank you for making this thread btw. Answer Hub has become useless in recent months.
Epic’s standard procedure lately seems to be to claim they can’t repro an issue without actually trying. They won’t even acknowledge it unless you make a repro project yourself and send it to them. Them maybe a month or two later they will add it to the issues list.