The fallback initramfs includes ALL modules of the kernel. If this works, but your normal initramfs does not, then you have to look into /etc/mkinitcpio.conf to look for the problem.
The Arch wiki may be a good resource to do this.
Difficulty: ★☆☆☆☆
Strong of its many members, the Manjaro support forum can provide you help whenever you have an issue with your Manjaro installation. But in order to work efficiently, we shall also ask you to follow three major points.
Trust Level 2) members and above.