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I reported it also.

To be fair, it looks as though it may only occur with UStructs members inside other UStructs that contain TMap members.

i.e


UStructA
{
    TMap<Key,Val>   MyMap
}

UStructB
{
    UStructA   StructAInst;
}


MyBlueprint
UStructB   StructBInst;

Modifying the Map in the format MyBlueprint->StructBInst.StructAInst.MyMap’ would then trigger a crash.

EDIT: ehhh, scratch that. The structs don’t even have to be nested. This is a pretty terrible bug, man :\