I tried to build a KDE x86_64 iso image, something go wrong during the build process :
warning: gparted-1.7.0-1 is up to date -- reinstalling
warning: timeshift-25.07.5-1 is up to date -- reinstalling
resolving dependencies...
looking for conflicting packages...
:: kpmcore25.04-25.04.3-1 and kpmcore-25.08.0-1 are in conflict. Remove kpmcore? [y/N]
error: unresolvable package conflicts detected
error: failed to prepare transaction (conflicting dependencies)
:: kpmcore25.04-25.04.3-1 and kpmcore-25.08.0-1 are in conflict
==> ERROR: Failed to install packages to new root
==> ERROR: Failed to install all packages
==> ERROR: A failure occurred in make_image_live().
Aborting...
--> overlayfs umount: [/var/lib/manjaro-tools/buildiso/kde/x86_64/livefs]
--> umount overlayfs: [/var/lib/manjaro-tools/buildiso/kde/x86_64/livefs]
[nls@lap ~]$
Thanks for your answer and suggestion, I build my own iso image with the packages I need, those packages are not present on the official Manjaro iso’s. (Ventoy, Raspberry Pi Imager, Discord, Krdc, Krfb…)
Best is to wait a while longer — possibly until the next Stable Update, but perhaps it won’t be that long.
There is an issue with the current kpmcore, which, as @stormschip mentioned, has now been remedied on the official installer ISO, but in order to get a working kpmcore, you’ll need to downgrade to the 25.04.3-1 version.
The problem is that the newer kpmcore does not allow vfat for the EFI system partition — it insists on FAT12 or FAT16.