DashedVMobject was displayed abnormal

### Describe the bug
when I add DashedVMobject of Square ,only horizon side were displayed.
**Code**:
class Test(Scene):
def construct(self):
square = Square()
dashed_square = DashedVMobject(square)
self.add(dashed_square) # **Display abnormal**
self.add(square.get_subcurve(0, 0.25)) **# Display normal**
self.add(square.get_subcurve(0.25, 0.5)) **# Display Nothing**

**Wrong display or Error traceback**:

### Additional context

system archlinux .
cpu intel i7-4770
graphic Intel(R) HD Graphics 4600