Toolbar menu items shrink after switching to library 26 support and AppBarActivity in AppCompatActivity

Yesterday I upgraded to new 26 support library and I also had to change the deprecated AppBarActivity to AppCompatActivity as it no longer exists.

I have the same problem as described in the link below, but "clean" or "rebuild" does not fix the problem. Why are the options menu items compressed if I'm using support library 26?

I have all my icons in hdpi and xhdpi. Some also in mdpi and ldpi ...

So why are my toolbar icons shrinking?

Here is the code I use in all my layouts that worked with all the previous support libraries (and I always use the most recent!):

   <android.support.design.widget.AppBarLayout
    android:id="@+id/myAppBar"
    android:layout_width="match_parent"


    android:layout_height="wrap_content">

    <android.support.v7.widget.Toolbar
        android:id="@+id/my_awesome_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"

        android:minHeight="?attr/actionBarSize" />
</android.support.design.widget.AppBarLayout>

      

        
        
        
      

    

All my icons are defined as attr, so I can provide a light and dark version.

<item
        android:id="@+id/action_logbook"
        android:icon="?attr/icon_book"
        android:orderInCategory="100"
        android:title="@string/logbook"
        yourapp:showAsAction="ifRoom"/>

      

        
        
        
      

    

This is the attr in icons.xml

<attr name="icon_book" format="reference"/>

      

        
        
        
      

    

This is the style that the actual icon provides:

  <style name="MyBaseThemeLight" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="icon_book">@drawable/icon_book_white</item>
</style>

      

        
        
        
      

    

Here is a screenshot from support version 26.0.0:

and this happens after the update:

UPDATE: It works when I put the ImageView directly into the Toolbox:

 <android.support.design.widget.AppBarLayout
    android:id="@+id/myAppBar"
    style="@style/myAppBarStyle"
    android:layout_width="match_parent"

    android:layout_height="wrap_content">

    <android.support.v7.widget.Toolbar
        android:id="@+id/my_awesome_toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minHeight="?attr/actionBarSize">

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="?attr/bt_expenses" />


    </android.support.v7.widget.Toolbar>


</android.support.design.widget.AppBarLayout>

      

        
        
        
      

    

UDATE 2: Changing the code in version 26 of the ActionMenuItemView seems to be a problem to me, as it does not resize the icons to keep the width and high level:

See: public void setIcon(Drawable icon)

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