App Version: 60
iOS Version: 10.2.1
Device: iPhone 6
URL: 
 
Steps to reproduce:
  1. Launch app
  2. Go to news.google.com
  3. Tap on one of the AMP articles

Reload this page by either
  4. Kill app
  5. Relaunch
OR
  4. Reload
OR
  4. Tap on a link
  5. Go back
OR
  4. Tap omnibox
  5. Validate URL
OR
  4. Add to reading list and open distilled page.
 
Observed results:
Page displayed is a redirection page to the non AMP page.
HTTP code is 200 so redirection is not automatically loaded.
 
Expected results:
AMP page should display
 
Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: YES
Bug reproducible on Safari/Firefox: Firefox: NA, Safari: YES
Bug reproducible on current stable build (App Version, iOS Version): Yes 58
Bug reproducible on the current beta channel build (App Version, iOS Version):Yes 59
 
As it reproduce on Safari and Chrome Android, I would say it is a Google News bug.