[Dynamic batching] Same sprite with same material not batching

Hi,

I've got 2 sprites in a scene. I use the frame debugger to see what draw calls are happening. I see that there are 2 identical items (same material (base sprite material), same sprite) that are drawn in 2 different draw calls. These draw calls follow each other. Do you know why these two sprites are not rendered in the same draw call?

Here is a screenshot that shows the problem:

Thank you