App Version:  66.0.3359.77 beta
iOS Version: 10.3.5, 11.2.6 
Device : iPads
URL: Chrome://flags,https://rsolomakhin.github.io/autofill/

Steps to reproduce:
1. Launch chrome 
2. Goto chrome://flags
3. Tap on Dropdown on any feature.
4. Send chrome to background
5. Relaunch chrome

Observed results:
Dropdown suggestions goes blank

Expected results:
Dropdown suggestions should be displayed.

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 : Yes
Bug reproducible on current stable build (App Version, iOS Version): Yes In M65
Bug reproducible on the current beta channel build (App Version, iOS Version): Yes in  M66 

Video :
https://drive.google.com/file/d/1nlDhKNJ3b0wya6F8VuRUviEP0AKVpzLh/view?usp=sharing.