Maliit keyboard wasn't working a long time on opensuse tumbleweed. When I updated kirgami-addons, the keyboard ended up working. However, I could not figure out how to add other languages. I hope this bug issue help other people.

zypper info maliit-keyboard
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Information for package maliit-keyboard:

Repository : home:dmitry-s
Name : maliit-keyboard
Version : 2.3.1-9.6
Arch : x86_64
Vendor : obs://build.opensuse.org/home:dmitry-s
Installed Size : 6.5 MiB
Installed : Yes
Status : up-to-date
Source package : maliit-keyboard-2.3.1-9.6.src
Upstream URL : https://github.com/maliit/keyboard
Summary : Maliit virtual keyboard
Description :
Maliit provides a flexible and cross-platform input method framework.
It has a plugin-based client-server architecture where applications
act as clients and communicate with the Maliit server via input
context plugins. The communication link currently uses D-Bus. Maliit
is an open source framework (LGPL 2) with open source plugins (BSD).

zypper info kirigami-addons
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Information for package kirigami-addons:

Repository : openSUSE-Tumbleweed-Oss
Name : kirigami-addons
Version : 0.4-1.1
Arch : x86_64
Vendor : openSUSE
Installed Size : 428.1 KiB
Installed : Yes
Status : up-to-date
Source package : kirigami-addons-0.4-1.1.src
Upstream URL : https://invent.kde.org/libraries/kirigami-addons
Summary : Add-ons for the Kirigami framework
Description :
A set of "widgets" i.e visual end user components along with a
code to support them. Components are usable by both touch and
desktop experiences providing a native experience on both, and
look native with any QQC2 style (qqc2-desktop-theme, Material
or Plasma).

zypper info maliit-framework
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Information for package maliit-framework:

Repository : home:dmitry-s
Name : maliit-framework
Version : 2.3.0-3.8
Arch : x86_64
Vendor : obs://build.opensuse.org/home:dmitry-s
Installed Size : 605.1 KiB
Installed : Yes
Status : up-to-date
Source package : maliit-framework-2.3.0-3.8.src
Upstream URL : https://github.com/maliit/framework
Summary : Maliit input method framework
Description :
Maliit provides a flexible and cross-platform input method framework.
It has a plugin-based client-server architecture where applications
act as clients and communicate with the Maliit server via input
context plugins. The communication link currently uses D-Bus. Maliit
is an open source framework (LGPL 2) with open source plugins (BSD).
This package also provides plugin support.

kwin_wayland --version
kwin 5.26.1

lsb_release -a
LSB Version: n/a
Distributor ID: openSUSE
Description: openSUSE Tumbleweed
Release: 20221021
Codename: n/a

zypper info libmaliit*
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Information for package libmaliit2:

Repository : home:dmitry-s
Name : libmaliit2
Version : 2.3.0-3.8
Arch : x86_64
Vendor : obs://build.opensuse.org/home:dmitry-s
Installed Size : 1.1 MiB
Installed : Yes
Status : up-to-date
Source package : maliit-framework-2.3.0-3.8.src
Upstream URL : https://github.com/maliit/framework
Summary : Maliit Framework shared libraries
Description :
Provides shared libraries built for the Maliit Framework.