App Version: 66.0.3359.67 beta
iOS Version: 11.2.6, 11.3 beta 6 only
Device:  iPad Air 2, iPad Mini, iPad Air
URL: 

Steps to reproduce:
  1.  Launch chrome beta 
  2.  Open incognito tab and open any URL
  3.  Perform below steps with some rigor.
  4.  Tap on Home button and quickly double tap on home button.

Observed results:
Notice that incognito webpage snapshot is displayed for a moment in app switcher mode

Expected results:
Incognito snapshot should not be displayed in app switcher mode

Number of times you were able to reproduce: 4/5
Bug reproducible after clean install: Yes
Bug reproducible after clearing cache and cookies: Yes
Bug reproducible on Chrome Mobile on Android: No
Bug reproducible on Safari/Firefox: Firefox: No, Safari: No
Bug reproducible on current stable build (App Version, iOS Version):  Yes on M65
Bug reproducible on the current beta channel build (App Version, iOS Version): Yes on M66

Link to video/image:  https://drive.google.com/file/d/1ulyxO4178JMXDNgIf_JEOKvyuq6cG2ss/view?usp=sharing