When entering "Propagate" in the search field of your online document, there is nothing.
We just found some info (not precise) about this, only there (https://www.bryntum.com/docs/gantt/#guides/project_data.md)
We are having Issue that occurs (look the screenshot). We know that a screenshot is not enough for you;
but maybe if you could pay attention to the error message that will give you a hint to see what could cause that issue.
2 issues (look the screenshot):
*) "Graph Cylce Detected"
*) "propagate ...."
The Gantt is loaded and displayed; We can manipulate it; but impossible to open up the Event Detail panel?
That issue occurs when :
// Load Task Event
this.gantt.taskStore.data = tabTaskEvent;
// Load Dependencies
this.gantt.dependencyStore.data = tabDependencies;
// Run propagation
await this.gantt.project.propagate();