Material toolbar menu background padding and color

I migrated by app to Material design 1.5.0. I use following code for toolbar (simplified):

Inside Activity:

<include layout="@layout/toolbar_default" />

toolbar_default:

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.MaterialToolbar
    ...
    app:theme="@style/defaultToolbarTheme"
    ...
    />

styles:

 <style name="defaultToolbarTheme" parent="Theme.MaterialComponents.NoActionBar">
     <item name="android:textColorPrimary">?app_toolbar_foreground_color</item>
     <item name="android:textColorSecondary">?app_toolbar_foreground_color</item>
     <item name="android:background">@drawable/item_background_menu</item>
     <item name="android:itemTextAppearance">@style/MyActionBar.MenuTextStyle</item>
 </style>

 <style name="MyActionBar.MenuTextStyle" parent="TextAppearance.AppCompat.Widget.ActionBar.Subtitle" />

item_background_menu:

<selector>
    <item android:drawable="@color/blue_click" android:state_pressed="true"/>
    <item android:drawable="@drawable/item_background_menu_drawable"/>
</selector>

item_background_menu_drawable:

<shape>
    <solid android:color="itemColor"/>
</shape>

colors:

<color name="itemColor">#1155a2</color>

Before the migration, toolbar menu looked like this:

After the migration, the toolbar list of menu items got some strange top and bottom borders/padding:

Can somebody tell how to change the color of this padding (currently it seems to be default grey used in Android menu), or even better, how to remove this padding? Thank you.

from Material toolbar menu background padding and color