I do not know if any issue ...

But found this on Melab's site:

LAB X1
Compatible with the following microcontrollers:

PIC16C64(A), 16C65(B), 16C662, 16C67, 16C74(AB), 16C765, 16C77, 16C774, 16F74, 16F747, 16F77, 16F777, 16F871, 16F874, 16F874A, 16F877, 16F877A, 16F884, 16F887, 16F914, 16F917, 18C442, 18C452, 18F4220, 18F4221, 18F4320, 18F4321, 18F4331, 18F4410, 18F442, 18F4420, 18F4423, 18F4431, 18F4439, 18F4450, 18F4455, 18F4458, 18F448, 18F4480, 18F4510, 18F4515, 18F452, 18F4520, 18F4523, 18F4525, 18F4539, 18F4550, 18F4553, 18F458, 18F4580, 18F4585, 18F4610, 18F4620, 18F4680, 18F4682, 18F4685

16F872 and 876 are not on the list ... simply forgotten or ???

Alain