Ah…I didn’t realize you were still using dependencies on those tasks in the Timeline batch selection.
According to 🔢 List of technical and data limitations in Asana there’s a limit of 30-45 dependencies per task. Could you distribute your dependencies such that each milestone has less than the limit of dependencies and all tasks that need to be are still in the dependency chain? Then if you shift a task’s date, it will adjust the others, depending (no pun intended) on your project dependency settings.
Another very different, maybe inferior, option would be not to use dependencies so you could use the batch selection in Timeline approach.
I think you’re right about Flowsana, but @Phil_Seeman can address that and is great with dependencies in general, so perhaps he can weigh in more generally as well.
Thanks,
Larry