Not sure to call this a bug, but I cannot find any valid use for the way it works. The “Set due date when the action is repeated” checkbox seems to be completely useless and broken.
What I want is a repeating task that starts every week on Monday and is due on Saturday of that week. I now understand from other threads here that doesn’t really work, but I had tried set up a repeating task any way and set it to start on Monday (1/18) and be due on Saturday (1/23) and set the “Set due date when the action is repeated” checkbox. I ended up with this weeks version of the task in my focus list with a due date of today but also with the next version of the task starting on 1/25 but with a due date of 1/23. Under what conditions would this be something you want.
I have removed the due date from my task, but the behavior here seems extremely broken.