北米の最新ファームは6/9提供(PKG6.4770)で、日本の6/11と同じ版数
https://www.sony.com/electronics/support/televisions-projectors-lcd-tvs-android-/xbr-43x800h#downloads
で、rtingsが6/10に最新ファームを適用したらその事象が発生すると言ってるんだ
なので最初からあったバグではなく、最新ファームが内包してるバグだと思われる
むしろ最新ファームにしない方がいいと思うぞ
Update 06/10/2020: After updating the X800H to the latest firmware, we were able to confirm a bug that other people have mentioned to us. If you turn the TV off while in game mode, when you turn it back on, the TV appears to still be in game mode, but it isn't. In order to get low input lag after turning the TV off and on, you have to switch to a different picture mode, and then switch back.