UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. Open several tabs
2. Pin the tabs
3. Close the browser
4. Reopen the browser, check that pinned tabs reopen
5. Close the browser
6. Launch a web page from an external application (for example StarCraft 2's launcher)
7. Observe that the pinned tabs are not loaded
8. Close the browser
9. Reopen the browser, note that pinned tabs don't reopen

What is the expected behavior?
Either:
9. Reopen the browser, note that pinned tabs reopen (and possibly that the externally launched browser only allows browsing on that single tab and will launch any additional windows in a 'regular' Chrome)

Or:
7. Observe that the pinned tabs loaded alongside the third party content
8. Close the browser
9. Reopen the browser, note that pinned tabs reopen

What went wrong?
Nothing went wrong, this behaviour appears to be 'by design' but it's undesirable and there does not appear to be an option to prevent the browser from behaving like this.

Did this work before? No 

Chrome version: 66.0.3359.139  Channel: stable
OS Version: 10.0
Flash Version: 

Although I can't imagine why someone would like the current behaviour, I can see why both options suggested under 'expected behaviour' could be favoured, so ideally Chrome would default to the most popular, but allow users to select the alternative.