App Version (from "Chrome Settings > About Chrome"): 66.0.3359.12 beta
iOS Version: 11.2.6
Device: iPhone SE

Steps to reproduce: 
Have tabs opened. Just by looking at the toolbar.

Observed behavior: 
I have 32 tabs open, but the tab switcher button on toolbar shows "..." instead of "32".
Tap on the tab switcher button to enter tab switcher. The button now shows "32".

Expected behavior: 
Show "32" in both cases.

Frequency: 
every time

Additional comments: 
I have Settings > General > Accessibility > Larger Text turned ON with the slider set to just around the middle. Not sure if this is relevant.

NOTE: This does not happen with Chrome from App Store.