Launch Flow: Chrome "Leave site?" dialog appearing at end of launch flow

[ianstewart]

Steps to reproduce the behavior

1. Go to wp.com/new
2. Proceed through to Editor screen
3. Click launch button
4. Proceed through launch flow
5. Get to "Hooray!" screen and observe error below

Result

[pauljacobson]

I have what seems to be a related issue. A user reported that when they publish a post, and then click the option in the block editor pane to the left to create a new post, they see a similar message in Firefox:

I encountered this issue in the last few days, although I can't seem to reproduce it now. The user's system information is as follows:

Mac OS Big Sur 11.1
Firefox 84.0.2 (64-bit)
Macbook Air M1 chip

I am also on macOS 11.1, using Firefox Developer Edition v85.0b7.

Source: 3641317-zd

[tbradsha]

Also reported in 3643293-hc.

I was able to reproduce on macOS 11.1, Chrome 87.0.4280.141:

1. Open a page.
2. Add an image block.
3. Update the page.
4. Click "View page":
   
5. Receive the "leave page" alert:
   

Note that if I cancel the alert, it'll still show the Update button as active, and I can repeat steps 3-5 indefinitely (without making any changes to the page).

[simison]

@Automattic/good-mountain was this something that's fixed in latest Gutenberg?

[Copons]

I'm not able to repro any of the 3 different issues reported here, tested with Chrome and Firefox on MacOS 11.1.
Since the reports, a new Gutenberg version (9.7 up to 9.7.2) has been merged to .com.
At a quick glance of the changelogs, nothing seems related to this issue.

In the off-chance I'm missing something in the repro steps, I'd love to have a new check (at least by @ianstewart as original author) before closing this issue.

[sirreal]

I don't see any obviously related recent changes and it isn't highlighted in the release notes for 9.6 or 9.7, both of which received recent upgrades.

It's entirely possible that it has been fixed without me being aware or finding it. I'm also unable to reproduce at this time and I think we can close.

[simison]

Thanks both! Let's close for now and be on the lookout.

[tbradsha]

Confirmed that I can no longer reproduce this, so let's hope it's fixed!