This comes up more than almost anything else, and the honest pattern I've seen: the practical checklist finishing and the emotional "this is home" feeling are on completely different timelines, and it's easy to expect them to line up.
For most people it's not a switch that flips — it's small, unremarkable moments (running into someone you know at the shop, not needing your GPS for a route, a joke landing in the local language) that quietly stack up until one day you notice you stopped counting the months. It's genuinely fine, maybe even normal, for that to take longer than the paperwork did.