Yes, there are two, with the second 1500 ft above the normal.
I tested using the F104 (it has both ILS and TACAN, as well as VOR). Also, has a great panel and excellent flight dynamics.
Initial setup was at KCQF (Fairhope), which lies directly beneath the KBFM (Mobile Downtown ILS flight path), 13 miles distant.
Tuned NAV 1 to 108.5 (Mobile Downtown ILS), set direction 320, and TACAN to 75X (KBFM VORTAC).
SET flaps full. With brake set, gave about 3/4 throttle.
Then set air location for 3000ft and 220 Knots.
Once Aloft turned to intersect ILS. At 13 miles, direction indicates, but glide path doesn't, until TACAN registers 9. Maintained 3000 until activation of glide path bar at 9 miles. Flew normal glide path to runway.
Then repeated process, but initially set and maintained altitude at 4500. Glide path bar activated at 9 miles. Flew down glide path, which terminated 1500 ft above threshold, with bar then fluttering up and down.
Found similar situation at KNPA, but it's a little harder to check without the VORTAC.
Suspect same may be present elsewhere, as well.
Not a problem CAVU or with a known elevation above an outer marker. but otherwise dicey in actual instrument conditions.
Happy New Year and Best Regards.