App Version: 64.0.3282.39 beta
iOS Version:10.3.3, 11.0.1
Device : iPhone,iPad

Steps to reproduce : 
1. Launch chrome.
2. Tap on Menu 
3. Send the app to background.
4. Double tap on home button to see chrome in Multitasking mode.

Observed results:
Blank Menu screen is displayed

Expected results:
Menu screen should not be displayed in multitasking mode.

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: NA
Bug reproducible on Dolphin/Safari/Firefox: Safari : NA
Bug reproducible on current stable build (App Version, iOS Version): No in M63
Bug reproducible on the current beta channel build (App Version, iOS Version): Yes in M64

Link to video :
https://drive.google.com/file/d/1NqfOIveSmq4bVm4tGSuDVf8ROvdf3pY-/view?usp=sharing