Same here with a cachyos-handheld version installed on a legion go 2.
I read some posts with similar issue but I wasn’t able to solve.
In this similar issue ( [SOLVED] Failed Boot with Thunderbolt Dock Attached / Kernel & Hardware / Arch Linux Forums ), someone said it was apparmor landlocks to cause the issue but following what he says doesnt fix for me.
It may also be due to plymouth conflicts. Next days, I’ll try to disable it and check if something changes. Here a tutorial of how to disabled it in case someone wants to give it a shot: [Tutorial] Disable or Remove Plymouth (boot splash) - #12 by Ugo