No cookies access for extension pages opened through browser.windows.create

When I try to open a window with browser.windows.create pointing to my index.html and inside of it I make a API requests to host (https) that explicitly specified in permissions manifest field, the cookies are not send to this host.

So in other words I can't do API requests to my own server from such windows. This works only from browser_action popover.

This behaviour differs from all other browsers, they allow to do this. So I think it's a bug, or maybe I miss something?
This does sound like a bug. Can you send a report via Feedback Assistant so we can share with the engineering team? Thanks!
No cookies access for extension pages opened through browser.windows.create
 
 
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