Thank you Lal.
I was going to mention “Yathābhūta ñāna” but I thought Yathābhūta ñāna was more about fundamental structure and composition of Rūpa.
You wrote,
Eventually, one will realize that no “rupa” (whether it is a poisoned cake or a poison-free cake) is of anicca, dukkha, and anatta nature.
You probably mean “Niccā, sukha, atta”, right?