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In LGPE there were Large/Small Pokémon.
When placed in HOME, these Pokémon kept their sizes.
When placed in Sword and Shield, these Pokémon reverted to normal Pokémon since there were no markers indicating sizes.
When placed back into HOME from Sword and Shield, these Pokémon stayed at their “normal” size, completely erasing their status as Large/Small Pokémon.
BDSP has no markers for size either within the code. This means that placing your Alpha Pokémon into HOME and then into BDSP will result in you losing said Alpha Pokémon to “normal” size reversion upon transfer.