Step 1: build landing pad
Step 2: rename
Step 3: copy+paste or blueprint+place
Result: landing pads will have the orginal default name
I tried the same steps on the same map without the railloader mod and it works.
So from my point of view the problem is caused by this mod.
Versions:
railloader: 1.1.6
space-exploration: 0.6.127
Krastorio2: 1.3.23