I upgraded from Camunda 8.2 to 8.6. We now have problems with Call Activity tasks and the template applied to it. We need to have propagateAllParentVariables set to true for some tasks. But, when we set it to True in the desktop modeler, when saving it is automatically removed.
It can not be yet configured in the template as stated in the doc.
But it would be nice to be able to configure it manually. As many variables were used from the parent process.