I have just built my second raid farm.  To the side of the spawn platform and at the same level I have constructed an observation room walled with glass panes.  If I save a game when I am near the back wall (south facing) upon reloading I will be outside standing on the narrow ledge left by the floor block.  As this platform in 130 blocks off of the ground there is obvious hazard here.  If I don't have a silk touch pickax on my person I am forced to destroy panes to get back inside.