I have the same issue with my XA ultra dual. I also did everything you've said here, when i enter safe mode i still cant see my home screen button menu and apps. And when i go to settings>apps>show system>xperia home to clear the data and cache but both are already cleared. Right now im using google assistant to open an app. This is a sample. Screenshot taken from my xperia XA ultra dual Screenshot taken from my XA ultra dual. Screenshot taken from my XA ultra dual.
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