For several months, the default Manjaro Plymouth theme has failed to display text.
Cause: In this commit, the plymouth package switched its font dependency from Cantarell to Adwaita Sans.
However, plymouth-theme-manjaro is still configured to use Cantarell. Since Cantarell was previously pulled in only as a dependency of plymouth, it is no longer installed on systems, causing the theme to find no valid font.
Current Workaround: Manually install cantarell-fonts and regenerate the initramfs with mkinitcpio -P.
I noticed this issue because I use a manual LVM on LUKS setup, which requires a passphrase prompt at boot. Since the standard Calamares installer doesn’t typically lead to this configuration, this issue might have gone unnoticed as Plymouth rarely needs to render text for most users.