NotAwfulTech

Perhaps not, but maybe "zemblanity", a word I found by searching "serendipity but bad":

Zemblanity is the opposite of serendipity, meaning that it is an unlucky or unwanted, but predictable, event. Although it might be difficult to imagine someone behaving in a manner that could be predicted to cause harm, zemblanity can occur as a result of complex human and organizational factors.

Per ness labs, which the only context I have for it is that it isn't a dictionary.