Can existing housing benefit force UC migration?

I've just discovered that I haven't been paid any housing benefit since the beginning of the year. I've lived here for 24 years and had HB all that time and the only change is my PIP has gone up recently to high care and mobility. I also get income-based esa support group. I've received nothing about migration to UC and last I heard I'd be one of the last groups to be forced to go. I'm hoping that it is a mistake that can be rectified but concerned that it might be viewed as a new claim which will mean being forced to UC.

Have I missed some news? Will existing HB claims not be honoured until the DWP dictate migration?

How people think a life on benefits is an easy ride I don't know. I'd give anything to go back to the work I loved and not live in constant fear of having my means of support whipped out from under my feet at any moment