I have found my page apple.stackexchange.com/questions/ask empty.
I had started to write a question, my draft was at most 3 days old. My draft was way younger than 1 week. So it was supposed to be saved and restored.
I have encountered this bug twice.
It would be nice to fix this bug.
Thanks for bringing this up. After chatting with the team (Marc Gravell) and confirming that increasing the draft duration would not be an issue performance-wise, I have bumped it from 3 days to 7 days. This will be live in the next production release.