I haven’t upgraded the packages and haven’t re-installed grub, yet.
I’m trying to find out if there are going to be problems for people with MBR and full disk LUKS encryption (I don’t have a separate un-encrypted /boot partition. The whole system is in one LUKS encrypted partition, which is sda1 in my case). 
I don’t know if re-installing grub to /sda will mess with the grub screen where one enters his passphrase to decrypt the root partition and load the system.
Could you please tell me if you MBR machine is also using full disk encryption and you also don’t have a separate boot partition? 
I’ve opened a thread here: https://forum.manjaro.org/t/reinstall-grub-bios-fully-encrypted-luks-partitions-will-this-work/6415
and I hope someone can help me with this before I start upgrading the packages and re-installing grub. I hope I find an answer before the next package update arrives… 
Thanks