Felix, could you try adding a 'sleep 1' at line 90 of /usr/share/initramfs-tools/scripts/init-top/framebuffer and rerun update-initramfs -u, to check if this addresses the issue for you?
Felix, could you try adding a 'sleep 1' at line 90 of /usr/share/ initramfs- tools/scripts/ init-top/ framebuffer and rerun update-initramfs -u, to check if this addresses the issue for you?