The stroke is not working for any geometry!!!

I ran the following code and it does not drawing the stroke line:

```
from manimlib import *
class shape(Scene):
def construct(self):
circle=Circle()
self.add(circle)
```

would be glad to have your comments on this issue. I have also tried the following code:

```
from manimlib import *

class SquareToCircle(Scene):
def construct(self):
circle = Circle()
circle.set_fill(BLUE, opacity=0.5)
circle.set_stroke(BLUE_E, width=4)

self.add(circle)
```

and the stroke is not acting.

_Originally posted by @Shafagh777 in https://github.com/3b1b/manim/discussions/1455_