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Current output
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logcat output
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Please provide the information as requested in comment #2, For us to further investigate this issue.

I am very sorry to reply this so late. i thought it was very clear in comment #1.

This is not a bug, just want to add a new feature.

In my case, i need to expand the height of the toolbar, and we want the menu button to be vertically in center of this toolbar, but buttonGravity api only accept Gravity.TOP or Gravity.BOTTOM, so we can only achieve it in a hack way ( set the value of buttonGravity to Gravity.CENTER_VERTICAL ), and i push my code to https://github.com/lixi0912/ToolbarExpandHeightDemo

We have passed this defect onto the development team and will update this issue with more information as it becomes available.