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I switched from the Mac to a Windows computer. Still can't save the file, but the error is different - multiple claims that 02798.m2ts is corrupt at various offsets.
I wonder if I got a new pressing with harder copy protection.

Nope, that's not it. I hooked it up to a much stronger USB power source, rebooted everything and tried again. Same result, same places.

I'm struggling with John Wick 4 also. I'm on a Mac, registered MakeMKV user. _private_data.tar was updated today. It reads through the main feature for quite some time, and then the errors start with (with lots of repeats): Error 'OS error - (ipc/send) invalid destination port' occurred while readin...

Wow. I emailed Billy asking how to order, got a response, and ordered it. In the afternoon on a Friday. It arrived on Monday morning. It's fast and it works. Amazing.