i've downloaded agrarian skies mod pack and agrarian skies hq server (FTBServer-1.6.4-965) via ftb launcher.
launched the server with the unofficial classic skyblocks map provided here (i'm using the brutal v1 version):
at first, i successfuly spawned on the correct block for classic skyblock map (even with the jadedspawn.cfg in server folder has different values), which is:
when my friend who has ftb launcher and agrarian skies mode, he spawns on that coordinates and falls through the world since there is no land beneath him:
(i guess these are the coordinates for the official agrarian skies map spawn coordinates)
i've already tried changing the coordinate values in the \AgrarianSkiesHQServer\config\jadedspawn.cfg file. i've also changed the values in FTB Client\AgrarianSkiesHQ\minecraft\config\jadedspawn.cfg file even if i think it is irrelevant to the server gameplay.