I expect the support menu to open.
While the support menu opens, I see a flash of the checklist on screen before the customer home appears again.
Chrome 77.0.3865.120 / macOS 10.15
(Also seen in the WP.com desktop app 4.5.0-beta1)

Moved to DotCom Manage for triaging.
I could definitely reproduce this a while ago, but I no longer can currently.

@rachelmcr Are you still seeing this issue?
Yep, I can still see the issue — at least on sites where I previously had access to the site checklist:

👋 @rachelmcr Are you still able to reproduce this? I added myself as an admin to the test site URL noted in the ticket description and I'm not seeing a flash in the latest version of Chrome, Firefox, or Safari.
Thanks for the nudge! I confirmed I am no longer able to reproduce this — not on an existing site where I completed the site checklist before, or after signing up for a new account/site and completing the site checklist. Closing!
Most helpful comment
Thanks for the nudge! I confirmed I am no longer able to reproduce this — not on an existing site where I completed the site checklist before, or after signing up for a new account/site and completing the site checklist. Closing!