New Manjaro update uses kernel 5.9, be sure to have installed nvidia 455xx driver before updating to new kernel, I wasn't been able to boot until I updated those anoying nvidia drivers.
@nikolal you could also use 450xx driver. That will also force installing the new nvidia driver for other kernel versions installed so user will have to manually install kernel modules for each other kernel version installed.
I've had 440xx before upgrading to 5.9 and couldn't boot after just regular "yay". I figure that you could make things work with other driver versions, I just posted what worked for me. Anyway good to know.