Player who use "concentric-circle" generation made by m2cengine using the modified building-platform v1.0.4 will need to add the compatibility mod alongside the actual building-platform mod to migrate the speed platform and keep the same world generation in their save. It must be kept as long as your save exist (this mod make sure that the world generation is the same). People that start a new game using building-platform v1.0.5 or later don't need this compatibility mod.
Removing this compatibility mod midgame will make the terrain not the same between old chunk and newly generated chunk.