More crashes Both in r1286 and r1290
else if(T.underlays.len) for(var/Over in T.underlays) X.underlays += T.underlays
https://github.com/d3athrow/vgstation13/blame/Bleeding-Edge/ code/__HELPERS/unsorted.dm#L942
It's adding the entirety of T.underlays for each underlay in T.underlays