LTI content gets discarded by incorrect relaunch

We found two different cases where course contents embedded via LTI get discarded by an incorrect relaunch of the LTI session. The same nonce and timestamp are reused which is against the LTI-specifications and lead to "nonce already used" or "timestamp expired" error messages.

First case is to switch between different courses via the tabs when LTI-content is shown in a tab.

Second case happens sometimes when LTI outcomes are reported back to the LTI-comsumer.