do you mean that PRA-LX3 got an upgrade to EMUI 9.1?
There was a bit of a miscommunication, im talking about Magisk root, on EMUI 8 you don't need patched recovery_ramdisk, (because ramdisk is not included in recovery_ramdisk). Simply flash Magisk.zip in TWRP and install Magisk manager apk.
And recovery partition will be not occupied by Magisk