DH pregen leaves holes in map when copying it over to server

my server is very slow at pregenning chunks (which makes me curious on how well itl handle dh in general, haven't gotten that far yet) so i did it on my local computer with local server and copied it over. on the singleplayer world which i gennerated this from, the entire region of the map gennerates fine. xaero's map is (aside from an oddly large chunk of the world) fully filled in, which would make me think that the chunks are fully loaded. however, when its copied over to the server and bluemap is used, there are a lot of holes in the map that only get filled by players loading the chunks. all of the areas that are uniquely filled-in were once explored by me. some of them were while i was actively on the server, others were when i was examining chunk load errors resulted by waystones in the singleplayer world. DH LODs are without these holes, probably because i copied over the accompanying LOD data both to the server and to my local Distant_Horizons_server_data folder, so that it loads faster img 1: bluemap's map for the server img 2: xaero's map for the local save. both world files are the same size, the server's is actually bigger because i pregenned a little bit of the nether last night (it got to 7.8/128 chunks radius, with an ETA in the several thousands of hours)