Text breaks Image-batches and vice versa

Unity Engine
1

I have a simple scene with Images and TextMeshPro texts.
Hierarchy is like below.

3e3e11c7b2e6e7e931c8ce37d050689c80e66203.jpeg
3e3e11c7b2e6e7e931c8ce37d050689c80e66203.jpeg848×751 81.4 KB

I’m expecting all the Images under each item are batched together and all the texts are batched together.
However here is what a profiler shows me.

f84b3a050ce363fad89bb60433141d614761a259.jpeg
f84b3a050ce363fad89bb60433141d614761a259.jpeg947×421 54.5 KB

It looks that images and texts are breaking batches each other.
Does anyone help me how I can get the expected batching result?

By the way, I already tried
・using regular Text component rather than TextMeshPro
・assigning same sprite and same Material on Images rather than None.
And I’m using Unity 2017.3.1f1

2

I found out the reason by myself that Item objects on the screenshot had y-rotation by accident so that images and texts are not coplanar with xy plane.

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