If for example you have a "rock"/ cliff  or "berg" base ,  it seems you cannot reliably re-paste to these entities.
The plugin seems to tag off "TerrainMeta" (not actually looked)?
Which always puts the paste object on  terrafirma.

So for example if you paste back to a frozen lake, the  base sits on the underlying mesh  just under the ice..  not "on" the ice.
which means you cannot always get back thru the doors...  Just like the  damned Airfield.....

I always use the height variable. Same thing happens on the top of mountains so I have to type: /paste mybase height 112.5 and do it over and over until I get the right height that works.

Same thing with my big oilrig base where I want the foundation legit on the ground, but the doors to have the water level 3/4th towards the door. So I think height would be somewhere between -47 to -49, then I have to do it a few times until I get it right.
I'm picky so I like to have it legit where I can still add foundations after the paste without using the build plugin.