Because he felt he didn't fit the job. Currently (as of September 5, 2022) Carola Schouten is acting Minister of Agriculture, Nature and Food Quality. She does this alongside her other Minister job.
Because he felt he wasn't suited to the position. Currently (as of September 5, 2022), Carola Schouten is acting Minister of Agriculture, Nature, and Food Quality, holding this role in addition to her other ministerial duties.