Yesterday a lot of measurements were added to the GIT for the Rockchip family.
I rebuilt a new version with kernel 6.6.41.
And eMMC started to be detected correctly.
The same problem when building the image yourself using compile.sh and installing from it.
I made images today with default kernel settings:
Armbian-unofficial_24.8.0-trunk_Rk3318-box_bookworm_current_6.6.38_xfce_desktop.img
Armbian-unofficial_24.8.0-trunk_Rk3318-box_bookworm_edge_6.9.8_minimal.img
Both of them show this problem.