I can copy clipboard content from applications info Far2L, but cannot copy from Far2L into another applications.
It looks that the next screenshot is the source of the problem:

My current configuration is:
KDE Neon 22.04.
Plasma 6.0.4
Wayland

Here is the printenv output from far2l: env.txt

Update: printenv with x11 settings: env-x11.txt
Update2: I can copy clipboard content to Firefox 126.0 (64-bit), but not to Chrome (Version 125.0.6422.112 (Official Build) (64-bit)), nor to Telegram

Update3:

jank@creator:~/.config$ locale
LANG=en_US.UTF-8
LANGUAGE=
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC=cs_CZ.UTF-8
LC_TIME=cs_CZ.UTF-8
LC_COLLATE="en_US.UTF-8"
LC_MONETARY=cs_CZ.UTF-8
LC_MESSAGES="en_US.UTF-8"
LC_PAPER=cs_CZ.UTF-8
LC_NAME=cs_CZ.UTF-8
LC_ADDRESS=cs_CZ.UTF-8
LC_TELEPHONE=cs_CZ.UTF-8
LC_MEASUREMENT=cs_CZ.UTF-8
LC_IDENTIFICATION=cs_CZ.UTF-8
LC_ALL=

Update4: Скрин Far2L

Update5

wx-config --version-full
3.0.5.0