Why can methylene not undergo the same intramolecular rearrangement as methylcarbene?

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carbene Nonbonding orbitals in triplet and singlet states

Methylene cannot undergo the same intramolecular rearrangement as methylcarbene because it is composed of only three atoms.1

Intramolecular rearrangements, such as the shift of a hydrogen atom from one carbon to another observed in methylcarbene, require a specific molecular structure to be chemically possible. Because methylene lacks the necessary structural complexity to facilitate such a shift, it cannot undergo this type of rearrangement.1