So I read somewhere online that the more recently manufactured Denon and Marantz receivers no longer have the hdmi 2.1 issues, that the receivers that are marked with certain serial numbers are not plagued by those issues anymore, does anyone know if this is true? I ask because I was thinking about purchasing the Marantz sr7015 but not if the problem with hdmi 2.1 still exists. Any help is very much appreciated.