I've encountered this bug today (2022-05-20) on Debian 11 and Ubuntu 22.04. 
Configuration:
Samsung SSD 500 GB as /dev/sda
- EFI System Partition
- MSR
- NTFS (C:)
- Recovery
Toshiba HDD 2 TB as /dev/sdb
- 1,9 TB NTFS (D:)
- 512 MB (/dev/sdb2 -> /boot/efi) 
- 2 GB swap (/dev/sdb3)
- 64 GB ext4 (/dev/sdb4 -> /)
It seems that even after selecting /dev/sdb2 as /boot/efi mount point to avoid 
tampering with the Windows boot loader's location, the installer mounts 
/dev/sda1 as the EFI partition. So the bug is still there and, for me, it 
happens also on Debian. This isn't a big problem for me, I've built the PC 
myself, I know how to use efibootmgr. What about a non-technical user?
Is it really a GRUB bug? Or it's an error of an early step of the installer 
which happens to be used also by the Ubuntu's installer (should they have some 
common parts)?

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https://bugs.launchpad.net/bugs/1396379

Title:
  installer uses first EFI system partition found even when directed
  otherwise

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