What is the issue with the cakes?

I took a little break from DBD in the hopes that the new MMR would be up and running when I next logged in, but alas it looks like that may never happen. LOL But I keep seeing posts about the birthday cakes not working as intended. I unlocked one in my blood web but should I hang on to it? I would certainly hate to use it if I can't get the full effect.

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