I've done so many of these, they're always falling off. Realistically, you can just remove the hanger as you have done. The centre section is light on the JTD, there is no midbox on it, and it is supported where it joins the backbox and also where it joins the cat so you can easily do without this bracket. However you can't leave it hanging as it'll fail the MOT, the rubber and bracket need to be removed from the car.
You can just weld it back on and fit a new rubber though, its dead easy to do it. I wouldn't be in any rush, get it done next time you're at the garage for something else.
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