After restoring into a course an lti activity from the front page:

-Opening the activity shows "Missing oauth_consumer_key in request".
-In the tool form the 'external tool type' setting loses its value.
-The 'using tool configuration ...' note of the launch url points to the wrong tool configuration.
-Selecting the correct tool type pops up a message that the tool configuration cannot be edited.
-Saving the form throws "Found more than one record in fetch".