Spawner Buckets irradiance doesn't subdivise and lock

[Arnaud_3DMS]

We have noticed something very annoying.

we've got 6 machines in the render farm, we've noticed that when a rendering is arriving to the finish of a task (irradiance pass for example) the bucket is not subdivided, it's a pity because it could increase the rendering vray would only have to subdividethe bucket in 4parts then in 4 parts etc etc.

[svetlozar.draganov]

Is Dynamic Bucket Splitting enabled, if it is the buckets should shrink toward the end of the rendering.
This is different however from splitting and stuck buckets which is already added as a features into our system.