Blog Post Create gadget has issues when added on a Dashboard

STEPS TO REPRODUCE

Preconditions: Blog Application is already installed.

1. Login as Admin
2. Create or edit a Dashboard page
3. Click 'Add Gadget'
4. Select and add 'Blog Post Create'
5. Delete 'Blog Post Create' gadget

EXPECTED RESULTS

The 'Blog Post Create' is added as a gadget and deleted properly.

ACTUAL RESULTS

The gadget cannot be removed from the Dashboard as the following warning is displayed on the bottom of the browser:

Failed to delete gadget:Forbidden

Also, in console there is the following line displayed:

2019-07-03 13:45:04,759 [http://localhost:1151/xwiki/bin/objectremove/A/B/WebHome] WARN  o.x.c.i.DefaultCSRFToken       - CSRFToken: Secret token verification failed, token: "", stored token: "ScpxrPSXd1AWgtS9wJXNiw"