Cannot play multiple animate of the same object at the same time (use AnimationGroup)

### Describe the bug

When using AnimationGroup to play multiple animate of the same object at the same time, It will only run the one after.
**Code**:

```
from manimlib import *

class Example(Scene):
def construct(self):
c = Circle()
self.play(
AnimationGroup(
c.animate.set_fill(GREEN, opacity=0.5),
c.animate.move_to(LEFT),
lag_ratio=0.5
)
)
```
**Wrong display or Error traceback**:

Output of the above code:

### Additional context

`lag_ratio=0.5`limits us from solving problems by using `c.animate.set_fill(GREEN, opacity=0.5).move_to(LEFT)`.
#1618