I once came across someone who was avoiding the meat at a lunchtime simcha. When I asked him why, he said it was because he had eaten "cereal with milk" at breakfast. When I expressed confusion, since as far as I understood only "hard cheese" (whatever your interpretation of that) requires waiting before eating meat, he replied that he received his practice from Chabad.
Is this really a known Chabad practice? If so, what is the source? I am leaning toward him being misinformed (or perhaps misrepresenting the true reason he wasn't eating the meat).