picolibc and cbprintf - linker error missing cbprintf

[boaks]

Migrating to NCS 3.4.0, zephyr 4.4.0, it seems that the newlib_libc is not longer available and picolibc must be used.
So I tried to switch to picolibc, but my code is using cbprintf and I get faced to an linker error

"undefined reference to `cbprintf' ".

I use:

# General config
# gone with NCS 3.4.0
#CONFIG_NEWLIB_LIBC=y
#CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_PICOLIBC=y
CONFIG_PICOLIBC_IO_FLOAT=y
CONFIG_CBPRINTF_COMPLETE=y

From the lib/os/CMakeLists.txt:

if(NOT CONFIG_PICOLIBC)
  zephyr_sources(cbprintf.c)
endif()

So, I really start to wonder, what I miss.

The doc - picolibc mentions cbprintf.
The migration guides also don't mention something recently about cbprintf.

The recommendation from Nordic - DevZone was to add " target_sources(app PRIVATE ${ZEPHYR_BASE}/lib/os/cbprintf.c) " to the projects CMakeLists.txt, but that seems to me very strange.