I've pulled the latest edk2-rk3588 changes and fixed the display bug: https://github.com/petabyt/edk2-rk3588-genbook
I won't be working on this anymore, especially since the edk2-rk3588 project isn't being actively maintained anymore (the owner has moved on).
Anybody else is welcome to pick up where I left off.
As a reminder: currently it won't boot anything through device tree mode. ACPI works but trackpad and emmc aren't supported yet, so you can't install anything.