Currently on my save file, Euclides Belt only loads from the halfway checkpoint whenever you click "Mission Start". After trying multiple solutions (rebooting the game, finishing the level and trying to start it again, selecting "restart mission", etc) the game continues to load Euclides belt from the halfway point. the cause of this bug is unknown, but as there are currently no save file options for this game (as of ver 0.6.21), the Euclides Belt checkpoint skip will be legal for any%.