I"m not sure it's a bug
I have a plate with holes on it. Created a 2D dwg and added hole table - fine
Now if I add a split line on part, open 2D dwg and the hole table is blank (all x,y cord. are gone)
here is what I did - see the att. part/dwg
1) created a part with 2 features: "Base" and "Add holes"
2) Created a 2D dwg and added hole table - ok
3) Edited part and added a "Add Square cut" and opened the 2D dwg - hole table is ok
4) Edited part and added "Split line1" and opened 2D dwg: The hole table is blank