On Office 365, in a customized document library a workflow initiate an approval task when a new item is created.
Once the task is completed the workflow update a status field of the document.
A second workflow has been set up to start when an item is modified to track the status change and initiate a second approval process.
It seems this On Modified Event is never triggered properly, the second workflow never start.
If a manual update of the file properties is done, it works fine.
Is it a bug ? Or unfortunately that's the way it is ?