So, did you get your answer?
If this happens, you can ‘check-in’ with the radar controller.
The instruction below from Tyler on check-in does not mention this, but the check-in instruction can be used to ‘remind the controller that you are there’. Be very careful not to abuse this though! The radar frequency can get very busy, and the last thing we need is ‘check-in spam’.
And…don’t be scared you’re being ghosted. I hear this often lately, but believe it or not, IFATCs are not on some sort of mission to ghost people.