Please go back to my original post. I said that the controller in DXB told me I was cleared for the RNAV but only to 2000'. Why?
Just guessing here but I think it was simply done in the wrong order.
The controller made a mistake, corrected themselves by clearing you for the RNAV and and while doing that realised you were only cleared to 3000. They then probably figured your next call would be to ask if you could continue to 2000 (which we get more often than not if we clear someone for the RNAV from above that), so added on the clearance to 2000.
Yes, that then made it confusing and I would understand someone wanting to reconfirm if they were still cleared for the approach but not everyone round here would.
Not the ideal thing to happen but with us doing so many different airports, where approach types are changing all the time, I'm afraid we are only human.