Cannot build Matter samples of nRF Connect SDK v1.9.99-dev1

Hi, I can successfully build the Matter light bulb example in nRF Connect SDK 1.9.1 but I fail to do the same in v1.9.99-dev1. 

What did you change?

Here the error:

west build -b nrf52840dk_nrf52840 -d build_nrf52840dk_nrf52840 -- -DCONF_FILE=prj_no_dfu.conf
-- west build: generating a build system
Including boilerplate (Zephyr base): /home/marco/Pingeco/exp/ncs/zephyr/cmake/app/boilerplate.cmake
-- Application: /home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb
-- Zephyr version: 2.7.99 (/home/marco/Pingeco/exp/ncs/zephyr), build: v2.7.99-ncs1-1
-- Found Python3: /usr/bin/python3.8 (found suitable exact version "3.8.10") found components: Interpreter
-- Found west (found suitable version "0.12.0", minimum required is "0.7.1")
-- Board: nrf52840dk_nrf52840
-- Cache files will be written to: /home/marco/.cache/zephyr
-- Found dtc: /usr/bin/dtc (found suitable version "1.5.0", minimum required is "1.4.6")
-- Found toolchain: gnuarmemb (/usr/lib/gcc-arm-none-eabi-9-2019-q4-major)
-- Found BOARD.dts: /home/marco/Pingeco/exp/ncs/zephyr/boards/arm/nrf52840dk_nrf52840/nrf52840dk_nrf52840.dts
-- Found devicetree overlay: /home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/configuration/nrf52840dk_nrf52840/nrf52840dk_nrf52840.overlay
-- Generated zephyr.dts: /home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/build_nrf52840dk_nrf52840/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: /home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/build_nrf52840dk_nrf52840/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: /home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/build_nrf52840dk_nrf52840/zephyr/include/generated/device_extern.h
-- Including generated dts.cmake file: /home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/build_nrf52840dk_nrf52840/zephyr/dts.cmake
Parsing /home/marco/Pingeco/exp/ncs/zephyr/Kconfig
Loaded configuration '/home/marco/Pingeco/exp/ncs/zephyr/boards/arm/nrf52840dk_nrf52840/nrf52840dk_nrf52840_defconfig'
Merged configuration '/home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/configuration/nrf52840dk_nrf52840/prj_no_dfu.conf'

warning: Experimental symbol CHIP is enabled.


warning: ZTEST_STACK_SIZE (defined at /home/marco/Pingeco/exp/ncs/nrf/Kconfig.nrf:44) defined without a type

warning: <choice OPENTHREAD_STACK_VERSION> (defined at /home/marco/Pingeco/exp/ncs/nrf/subsys/net/openthread/Kconfig.defconfig:13) defined with type unknown

warning: <choice OPENTHREAD_STACK_VERSION> (defined at /home/marco/Pingeco/exp/ncs/nrf/subsys/net/openthread/Kconfig.defconfig:13) defined without a prompt

warning: the default selection OPENTHREAD_THREAD_VERSION_1_2 (defined at subsys/net/l2/openthread/Kconfig.features:13) of <choice OPENTHREAD_STACK_VERSION> (defined at /home/marco/Pingeco/exp/ncs/nrf/subsys/net/openthread/Kconfig.defconfig:13) is not contained in the choice

error: Aborting due to Kconfig warnings

CMake Error at /home/marco/Pingeco/exp/ncs/zephyr/cmake/kconfig.cmake:272 (message):
command failed with return code: 1
Call Stack (most recent call first):
/home/marco/Pingeco/exp/ncs/zephyr/cmake/app/boilerplate.cmake:544 (include)
/home/marco/Pingeco/exp/ncs/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:24 (include)
/home/marco/Pingeco/exp/ncs/zephyr/share/zephyr-package/cmake/ZephyrConfig.cmake:35 (include_boilerplate)
CMakeLists.txt:15 (find_package)


-- Configuring incomplete, errors occurred!
FATAL ERROR: command exited with status 1: /usr/bin/cmake -DWEST_PYTHON=/usr/bin/python3 -B/home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb/build_nrf52840dk_nrf52840 -S/home/marco/Pingeco/exp/ncs/nrf/samples/matter/light_bulb -GNinja -DBOARD=nrf52840dk_nrf52840 -DCONF_FILE=prj_no_dfu.conf

Apparently the OpenThread stack version is not defined and it complains about the default one. I could not find anything about it in the documentation: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/matter/light_bulb/README.html#matter-light-bulb

Thank you.

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