Android vector drawables not supported for foregrounds

I'd like to use a Android vector drawable file as my adaptive_icon_foreground.
When I try to, I get the message:
```
Android minSdkVersion = 16
Creating default icons Android
Overwriting the default Android launcher icon with a new icon
Creating adaptive icons Android
NoSuchMethodError: The getter 'width' was called on null.
Receiver: null
Tried calling: width
pub finished with exit code 2
```

I'm using a vector drawable generated by the official asset editor.