I was trying to create a toolbar that had some buttons alligned on the end (right side) of the toolbar and also using the new Adaptive flag (to also have overflow items) and it seems that the spacer element does not take into account the size of the overflow button at the end.
I had to enter an empty label element at the end of the toolbar content elements to get enough empty space for the overflow button not to overlap with the last toolbar button
<ToolBarTemplateItem>
<label style="width:30px;"></label>
</ToolBarTemplateItem>
Is there a better solution or is this a bug that will be addressed in a future release?