3rd OS installed: Grub does not remember last selection?

I had a dual boot Ubuntu 22 and Windows 10.

I added 3rd OS Ubuntu 20.

However, now the Grub does not remember my last choice and I always have to be carefull on startup if I want to load the last OS I was using.

What happened with 3rd OS installation to mess this up? I checked my /etc/default/grub on Ubuntu 22, and it looks OK:

GRUB_DEFAULT=savedGRUB_TIMEOUT_STYLE=hiddenGRUB_TIMEOUT=10GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=off"GRUB_CMDLINE_LINUX=""GRUB_SAVEDEFAULT=true

Not sure which Grub should I look into, the one on U22 or the U20 which I just installed?