In a multisite network, the Toolbar site displayed after My Sites is changed to the root of the site when the admin User adds the Toolbar to the URL so they can edit the page. The Edit Page is also not displayed in the Toolbar.

Steps to reproduce the behavior:

• login to WordPress
  -- in a multisite network
• select one of your multisites
• verify the correct site is loaded after My Sites
• create a simple test page
• publish the test page
• copy the link for the page and open the link in a new tab
• paste ?bar=yes to the url and press return on the url to display the toolbar
• notice that the multisite display after My Sites shows the main root site now instead of the multisite you are in based on the url you selected
• notice that the Edit Page does not show either

Expected behavior:
The selected site should display properly after My Sites and the Edit Page should display to the User.

• used WordPress 5.1.1 and the Gutenberg release installed with this version
• OS: Windows 7 Enterprise
• Browser chrome Version 73.0.3683.75