The good news is before FMS switches to LOC1/NAV1, as long as you dialed in the ILS freq manually, it will persist through the change. Verify GS armed switches to Active and you have a rate of descent, enjoy the ride to MDA.
Bonus - if you’re using the Working Title G3000, if ILS decides to quit out at any moment on final, point the green Flight Path Marker on the runway numbers and adjust throttle, instant 3 degree glide slope.