uvm_reg_map::backdoor() issue when using .mirror task

[yakirp]

I encounter a warning when I am using ".mirror" task:
Register 'm_reg_model. <register name> ' is not contained within map 'Backdoor'
I found that the warning created because of calling to uvm_reg_map::backdoor(); which create new map.
How can I solve this issue?

Note: This issue did not occur when using peek or read (with UVM_BACKDOOR) tasks.

Thanks,