I noticed this thread, I had the same issue. And found the solution here: Pine A64-LTS not booting and [RESOLVED] PineA64LTS doesn't want to boot.
Seems that in my dtb-file there was something missing what caused the root not being found or mounted??, the option: non-removable;
meson-sm1-a95xf3-air.dtb has it also missing on mmc@ffe05000 from what I think is your root, the option: non-removable;
Hope it helps
It solved my UUID not found problem.