It depends on the circumstance and we all know in 1A their are some crazy things that happen. Without getting into much detail, you do have split parents, some that want control over every aspect. Luckily that is a rare thing, but it obviously still happens.
one example, and I could be wrong, was the Brookesmith kid that was looking at Richland but ended up at May. That seemed fishy.
Where I am from, if we had any kids move out of town to Canadian or Pampa, they would be ineligible for a year at that school. My older brother did this in 98’, but was granted eligibility when he went back to Miami (because that’s where our residence was.
if he lived in Pampa or Canadian, and went to Miami in elementary or even JH he would be fine. But if he made the choice to go to Pampa and then tried transferring to Miami, he would be ineligible due to not living in the same county.
some get waivers, some don’t. But I’m pretty sure this is how it works.