The Yamaha 5600 can decode those formats. However, it has the old HDMI chips which can't handle the bandwidth of 4K with HDR to be sent to the display. You can work around this with an HDMI splitter or a Blu-ray/UHD player with two HDMI outputs.
The term pass through is technically incorrect with HDMI but I know what you mean. With HDMI nothing is passed through, it is repeated. To repeat a signal the repeater (switch, sound bar, receiver, etc.) needs to have the capability of handling that signal. So it needs enough bandwidth and the same or better HDMI/HDCP version, even if it is not doing anything to the signal and just repeating it.
If you are wondering why they don't just simply pass through the signal, especially with something like a switch which doesn't do anything to the signal. The reason is every time you add connections with HDMI you change capacitance and that alters the waveform of the signal, which then might not be recognized by the receiving device. So with HDMI the signal needs to be repeated. Again, some understand this already but I post this for the people that don't and relate pass through to the analog world where it is a different situation.