Could this be a reason?
The Sony X85J is a mid-range 4k TV in Sony's 2021 lineup. It's a replacement for the Sony X85H that was never released in North America; the closest model we've ...
www.rtings.com
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Update 11/24/2021: We rechecked 4k @ 120Hz support on this TV. Unfortunately, like most other TVs we've tested in 2021, it can't display 4k @ 120Hz signals properly. The vertical resolution is cut in half, resulting in a 3840 x 1080 interlaced signal, so text isn't displayed properly. We tested this previously, and it was working intermittently, but now it is consistently not working.
The Sony X85J supports most common resolutions, except 1440p, which requires a forced resolution. It displays proper chroma 4:4:4 in all natively supported resolutions; you only need to be in the 'Game' or 'Graphics'
Picture Mode. For signals that require full bandwidth, set
HDMI Signal Format to 'Enhanced Format'."
Edit: Also, do all HDMI Inputs support HDMI 2.1? I know some TVs have it on all Inputs, some only one one or some specific ones.