Niantic confirms the issue in Pokémon GO where Morpeko doesn’t change from full belly into hangry form or vice versa if Aura Wheel knocks out its opponent has been resolved in release 0.339.0

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Morpeko sometimes doesn’t change form in battle

Issue Description: When used in battles, sometimes Morpeko doesn’t change from full belly into hangry form or vice versa if using the attack Aura Wheel knocks out its opponent.

Issue status: Resolved in release 0.339.0.

Source: Official Pokémon GO site

Source:Pokémon