I don't think the prior packaging actually "failed". In each case, Intel simply dropped the premium packaging around the time each processor's successor was released. They were no longer positioned at the top of the product stack, and were seeing price reductions at retail, so it didn't make much sense to keep shipping them in a special box.
Orders for the 9900K in its dodecahedron packaging were discontinued at the end of June 2020, but its successor, the 10900K, had already launched a month prior. By that point, the 9900K was only comparable to the 10700K, a processor with an MSRP over $100 lower.
And recently we heard that the 10900K's premium packaging is set to be discontinued at the end of this month, but that's because Rocket Lake processors should be coming next month. Again, the processor will no longer be the best they offer for their mainstream platforms, so it doesn't really make sense to keep shipping it in enthusiast packaging.
Likewise, I would expect the exact same thing to happen with the 11900K. As soon as the 12th-gen Core processors start coming out, they will likely drop the fancy box in favor of more traditional packaging.