Just had my question migrated from stackoverflow, but couldn't find the question anywhere until I looked in
active. Shouldn't the question also appear in
Migration counts as the "latest activity" on a question, which drops the question in the active feed and shows it on the front page.
The age of the question is still whatever it actually is based on the timestamp set when you posted it. So your question does show up under "newest" in its appropriate chronological spot. (As I'm writing this, it's on page 5.)