Steps:
- have a VM based on an instance type and start it
- when running, edit the instance type and wait until the "next run" icon will be shown
- edit the VM
Result:
The progress icon will be shown in the loading dialog forever and no exceptions thrown
More details:
It is a race - in one specific case we don't stop the progress even all the data are loaded already. It happens randomly - simulated on current master but did not simulate on 3.5 branch even the code is the same.