I corrupted my The Land Before and a sealed affix was the only thing that got added, nothing got removed, but now I get no 4 companions, it’s also the only unique idol. Am I missing something with the corruption, is this a bug or is my item broken now?
I would assume that’s a bug. Corrupting it must make it so that it’s not a unique item anymore. As the tooltip shows, it’s now a lengedary and not a unique. I’m guessing that the code is checking for unique count == 1 and it’s now returning 0 so it won’t activate that affix.
I would advise you to make a bug report using the in-game tool.