To reproduce this little bug create a new button with code Go {destpath}. Configure it to show label but don't define a tooltip. The toolbar is configured to not showing labels. When you move the cursor above this button the tooltip shows "C:\Windows\System32{DESTPATH}" instead of the label.
There's a specific Go DESTPATH command for that, FWIW.
Fixed in DO11 Beta3 and showing correct tooltip now. Many thanks for that. 