Question about an error during after installing Xiaomi EU ROM via TWRP


Dec 19, 2021

I have a Xiaomi POCO F3 (alioth). Today, I've installed latest xiaomi.eu_multi_HMK40_POCOF3_V12.5.18.0.RKHCNXM_v12-11 via latest TWRP 3.6.0. Before the installation, I've also used an option "Format Data" in the Advanced tab of TWRP.
However, at the end of the installation, I've got three errors:
failed to mount /system_ext (invalid argument)
failed to mount /vendor (invalid argument)
failed to mount /product (invalid argument)

I've immediately started searching for possible causes and solutions, and found out that it was probably due to pattern lock which I've had enabled. Anyway, in the meantime, I've rebooted the phone, and to my surprise, the phone succesfully booted to the Xiaomi EU ROM, that I've just installed and everything seems to work fine.

My question is: Isn't there any background issue, that I should resolve, or can I just ignore those errors mentioned above?