App Version: 69.0.3496.0 canary
iOS Version: 11.4.1, 12.0 beta#4
Device: iPhoneX, iPhone6s, iPad Pro
URL: https://chrome-test.github.io/snapshot

Steps to reproduce:
[Keep device in Portrait mode]
  1. Launch Google Chrome
  2. Launch couple of tabs and then the test page linked above
  3. Reload the page, and then switch to any other tab
  4. Rotate the device to landscape mode and wait for ~10sec (Test page reloads every 10seconds)
  5. Rotate the device to portrait mode
  6. Enter TabSwitcher again.

Observed results: Observe that the snapshot for the test page tab is empty

Note: If you are reproducing on iPad you need to have ~12 tabs.
      Works fine with old tabswitcher. Snapshot is always displayed. Tested on M69 with UIRefresh disabled.

Please let me know if you need any other details.

Expected results: Snapshot should be displayed all the times.

Number of times you were able to reproduce: 5/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes

Link to video/image: https://drive.google.com/file/d/1VsGmsYbpnZAoSOiXAdmdQjoTzKcckS1L/view