Hi,
Find below a forum link to build without issue your arm image 
1
$ sudo pacman -S manjaro-arm-tools
2
$ sudo getarmprofiles -f
3
$ sudo buildarmimg -d on2 -e kde-plasma -v myfirstbuild -n
or
$ sudo buildarmimg -d oc4 -e kde-plasma -v 2023.04.28 -b stable n
4 find the image here
/var/cache/manjaro-arm-tools/img/
Enjoy !