Mark, I think you experienced something like this previously. Did you figure out the root cause? Was it due to tab grid code or was it related to bad saved sessions? Looks  like a terrible user experience.

I had seen this, but I can't repro it now.

mardini, can you repro this now? 

Not reliably and consistently but I showed to Mark. 
The only thing I can tell you is that if we lose the title, then that means the tab lost the URL and won't load. See this video:
https://drive.google.com/file/d/1xXcmlbpw-9pHFfaQxRRgj5BO-UeM0973/view?usp=sharing

The common factor is that these tabs have been there for a while (but they're not the oldest tabs as you can see). 

Not sure how difficult it is to solve this issue, but I wanted to assign some size value. Setting to medium. 

Not sure why the tab would lose the URL. I'd like to put in a DCHECK in the tab grid so that any loss of a URL fails loudly. 

Based on the video, this looks like a slim-navigation-manager bug to me.
https://bugs.chromium.org/p/chromium/issues/detail?id=815248#c14

Thanks, Srikanth. I have the "Use slim navigation manager" flag set to default though. 

Danyao: Is this related to  issue 815248  ?

From the video it does look like crbug/815248. Since you're using M67 on iOS 11.2.6, it's possible that you're enrolled in the 50% #slim-navigation-manager experiment, even though you don't have it turned on explicitly.

One way to empirically check if you have #slim-navigation-manager enabled is to visit http://w3c-test.org/html/browsers/history/the-history-interface/. Click on 001.html. If you see the test page briefly but it redirects back to the directory listing, then you're using legacy navigation manager. If you see the test running followed by a test summary page, then you're using #slim-navigation-manager.

Thanks, Danyao. I see the test running followed by a test summary page (attached). So it seems I am using #slim-navigation-manager. 

Marking this as a dupe of  issue 815248 . 

For posterity, here is what I got when performing the check outlined in #11.

Deleted: IMG-8368.JPG 742 KB

	IMG-8368.JPG 742 KB View Download

@Mardini if you see this again please update here. Danyao has fixed the issue this is duped against.