Well that’s odd… I changed the colour manually as well and then manually back again. I assume it’s due to the default button colour being changed to the blue, and the old default colour (as here) is still not being added to the XML due to it being a(n old) default value. When I copy Window to XML, I don’t see the colour in there. When I change the BG colour to something else, it then appears in the XML.
Change B by 1