Naming policy of Sprite in absence of %number% placeholder

Support
1

Product

Encoding - VOD

Question

When adding sprite https://developer.bitmovin.com/encoding/reference/postencodingencodingsstreamsspritesbyencodingidandstreamid,
we set vTiles = 2, hTiles = 50, spriteName = sprite.jpg and other parameters.
Then a stream yields 101 images.
We got sprite-0.jpg which contains 100 images and sprite-1.jpg which contains 1 image.

Is this expected behavior?
Since we do not have %number% placeholder explained in imagesPerFile param in above link,
I expect we get sprite.jpg which contains 100 images and 101th image is abondoned.

2

OK, I now read

If more images are generated than specified in this value, multiple sprites will be created.

in imagePerFile description.

If %number% placeholder is not explicitly set, what naming policy is used?