the PS5 is fucking weird with enabling 1440p tho, it always tests all image modes (60hz, 120hz, HDR on/off) if you set it to 1440p... and I might now know why after talking to a friend who has a Sony TV.
so Sony TVs apparently have issues with 1440p signals, which further explains why Sony refused to support it I guess.
so I looked up some rtings reviews and well,
some Sony TVs, recent ones even, support only certain refresh rates at certain resolutions.
so some 2021 models only support 4K120hz and 1080p120hz but not 1440p120hz
other models don't support 1440p at all... and yet other models only support 1440p if the device can force it somehow, like with a custom resolution setting using the Nvidia control panel.
that is so fucking weird, but I guess that's why Sony really took ages to support it, and still don't support it on their 1440p device, the PS4 Pro...