Steps to replicate the issue (include links if applicable):

• Start writing a bug report in phabricator
• Put the computer into standby to return to it hours later
• Continue writing the bug report
• Try to Create New Task

What happens?:

It shows the the error:

Unhandled Exception ("AphrontMalformedRequestException")
You are trying to save some data to permanent storage, but the request your browser made included an incorrect token. Reload the page and try again. You may need to clear your cookies.
This was a Web request.
This request had an invalid CSRF token.

What should have happened instead?:

It should create the issue without showing such an error. If such an error is shown the text should not be lost – I pressed back but the the issue text field did not have my previously written description anymore, that text was lost and couldn't be recovered. It's not really a problem that this unhandled exception occurred but that there was no way to get the text back.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

The issue is in phabricator.

Other information (browser name/version, screenshots, etc.):

Firefox.