While the EF demands ratcheted up in each skip, the intellectual demands stayed fairly constant. So, school was challenging, but not in the right way and by the end of that year, he was begging to be homeschooled again.
Similar experience here. My son skipped 5th grade, and subject accelerated into 7th grade science, 8th grade math. He has EF issues. He does better socially in middle school than with age mates.
He is bored in all his classes except science (Which is more rigorous than the biology class I took in high school). The EF demand is challenging him, but intellectually he is bored. He has made progress on some EF, organization and study skills. But as soon as he adjusted and realized the material was easy, he backed off on those and isn't developing more ability in that area.
