Follow-up Comment #7, bug #39527 (project grub):
I attached the log file (compressed to fit within the size limit).
Steps to reproduce:
Start with /dev/md0 containing 2 devices, in my case sda1 and sdb1
Remove sdb1:
- mdadm /dev/md0 --fail /dev/sdb1
- mdadm /dev/md0 --remove /dev/sdb1
Set md0 to 1 disk: mdadm --grow /dev/md0 -n 1 -f
Run grub2-install /dev/sda (don't know if this step is required)
Set md0 to 2 disks again: mdadm --grow /dev/md0 -n 2
Add sdb1: mdadm /dev/md0 --add /dev/sdb1
Wait for sync to complete
Run grub2-install /dev/sda
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