It's not Panasonic, it's Panasonic Solutions, a completely different company. Litigation is not clear and it is unlikely that they are responsible. They developed two chips in 2019, one 24 Gbps with three input ports (Yamaha) and another one 40 Gbps, with one input port (SU's choice). It is engineers from AVR vendors that need to know what is it exactly that they are looking for when ordering a chip.
For example, if you say to chip vendor that you want a chip with several speedy inputs and your AVR to work with consoles at 4K/120Hz 10-bit signal, they can tell you that they either have or have not a solution. The vendor had 24 Gbps chip and sent it, as it does support stated features. But i
f you do not ask them about additional features that chip might need to have to work fully with consoles, such as RGB colours, chroma 4:4:4 etc, all of which requires 40 Gbps speed in total, then the chip vendor will send you what you asked for only, because you did not ask for anything more. It's a complex story. In addition, people in Yamaha might have thought that 24 Gbps for 2020 models was not enough and asked the vendor whether their chip supports DSC, to compress signals up to 3.75:1 ratio, so that wider bandwidth signal from sources and displays is supported. The chip vendor might have said: "Yes, we have that feature too". "Ok, send us, we are covered then". No one in Yamaha asked the question whether 4K TVs actually support DSC protocol, vast majority of which do not. Bam! Black screen. DSC is a hardware feature and cannot be added by firmware. The fiasco from last year begs a question about engineers' knowledge of consumer electronics market, features implemented on TVs' SoC etc. It's hard to resist not to feel the word
incompetence in the air.
Here is one analysis of this problem. Curiously, after this damning video, he never went back to this topic.