Comment 108 for bug 1396379

I tested this in 23.04 new installer. It worked, hooray. This is what I did.
Using virtmanager (qemu) on a 22.04 host, I downloaded the 23.04 ISO and created two virtual storage devices (drives).
I installed 23.04 on one of them, using the advanced configuration option to make it a UEFI VM (it's legacy BIOS by default). I did a standard automatic install, rebooted and it works: this is a normal one-drive Ubuntu install. There were two partitions, including 1 GB UEFI partion mounted at /boot/efi exactly as you would expect.

Then I added the second drive to the VM, got it to boot off the install ISO again, and did another install. I went to manual partitioning. I selected the new, second drive as the boot device. The installer immediately created 1 GB vfat partition on the second drive, mounted at /boot/efi and selected it for formatting, which was encouraging.
I formatted the reaming space as ext4 and mounted it to /, and then installed.

The new efi partition was populated. I made the second drive the boot drive and booted from it (you can also activate a boot menu and choose it). There is definitely a working EFI install on the second drive, and grub menu offers the original install as a secondary boot option, which is what I would expect to see.
Also, when I reconfigure grub on the first install to show the grub menu, there is no hint of the second install, which is proof to me that the original EFI partition was untouched by the second install.