Unexpected behavior of keyboard input in Konsole

Dear Community, good day!

Since one of the recent updates I am in trouble with Russian language in Konsole (another emulators tried out as well). Russian input in Vim appears as key-codes, any argument passed using Russian symbols leads to an error like following:

$ find /home "док*"
...
find: '\320\264\320\276\320\272*': No such file or directory

In virtual console (logged in as same user, by Ctrl+Alt+F2) input in question works like intended.
Any advice will be highly appreciated, many thanks in advance.

Some technical info:

Manjaro KDE edition

$ uname -a
Linux Lenovo100 5.4.60-2-MANJARO #1 SMP PREEMPT Sat Aug 22 14:35:41 UTC 2020        x86_64 GNU/Linux

$ locale -a
C
POSIX
en_US.utf8
ru_RU.utf8

$ locale
LANG=C
LC_CTYPE="C"
LC_NUMERIC="C"
LC_TIME=ru_RU.UTF-8
LC_COLLATE="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_PAPER="C"
LC_NAME="C"
LC_ADDRESS="C"
LC_TELEPHONE="C"
LC_MEASUREMENT="C"
LC_IDENTIFICATION="C"
LC_ALL=

$ cat /etc/locale.conf 
LANG=en_US.UTF-8
LC_TIME=ru_RU.UTF-8

$ cat /etc/vconsole.conf 
KEYMAP=ru
FONT=ter-v16n