bitbake not populating sysroot correctly with qt libs

I am using a b2qt manifest v6.9.0.xml to build an image bsp. I have added a layer with our own customisations, recipes, bbappends etc. and build a successful image with MACHINE=raspberrypi-armv8 for the rPi4.

I am now trying with MACHINE=raspberrypi-cm3 but I ma running into several problems.

1. The image is somewhat spare compared to the rPi4. I am having to add many basic utils things like top and vi to IMAGE_INSTALL:append.

2. In a recipe for our custom application (that built fine for CM4 / MACHINE=raspberrypi-armv8) I get the following error.

| CMake Error at CMakeLists.txt:24 (find_package):                                                                                                    |   Could not find a configuration file for package "QT" that is compatible                                                                           |   with requested version "".                                                                                                                        |                                                                                                                                                     |   The following configuration files were considered but not accepted:                                                                               |
|     /home/myuser/yoctoBuilds/rPi4-Qt6.9/build-raspberrypi-cm3/tmp/work/cortexa7t2hf-neon-vfpv4-poky-linux-gnueabi/pisp/1.0+git/recipe-sysroot-native/usr/lib/cmake/Qt6/Qt6Config.cmake, version: 6.9.0 (64bit) 

So poking around it seems that when building our application (pisp here) the target sysroot (pisp/1.0+git/recipe-sysroot/usr/lib/) has not been populated with any qtlibs. In my bb file the hopefully relevant part is below:

# Adding these 2 flags for raspberrypi-cm3
EXTRA_OECMAKE += "-DCMAKE_FIND_ROOT_PATH=${STAGING_DIR_TARGET}"
EXTRA_OECMAKE += "-DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ONLY"

# to aid debugging
EXTRA_OECMAKE += "-DCMAKE_VERBOSE_MAKEFILE=ON"
# Force dev files to be staged
SYSROOT_DIRS += "${STAGING_DIR_TARGET}/usr/lib/cmake"


EXTRA_OECMAKE += "-DQT_HOST_PATH=${STAGING_DIR_NATIVE}/usr"
EXTRA_OECMAKE += "-DCMAKE_PREFIX_PATH=${STAGING_DIR_TARGET}/usr;${STAGING_DIR_TARGET}/usr/lib/cmake"

inherit cmake qt6-cmake

# Build dependencies
DEPENDS += " \
    qtbase \
    qtdeclarative \
    qtdeclarative-native \
    qtserialport \
    qtwebsockets \
    qtdeviceutilities \
    qtbase-native \
    qttools-native \
    qtmultimedia \
"

As mention above the recipe runs find for raspberrypi-armv8, in addition the bsp builds fine and I am able to install and build our app in qtcreator.

Does anyone have any ideas?

Bitbake config

Build Configuration:
BB_VERSION           = "2.9.1"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "arm-poky-linux-gnueabi"
MACHINE              = "raspberrypi-cm3"
DISTRO               = "b2qt"
DISTRO_VERSION       = "5.1.2"
TUNE_FEATURES        = "arm vfp cortexa7 neon vfpv4 thumb callconvention-hard"
TARGET_FPU           = "hard"
SDKMACHINE           = "x86_64"
QT_VERSION           = "6.9.0"