I don’t know if the disk array is based on disk name, I would admit I didn’t try. I find it odd however it doesn’t take the hardware disk order on startup It’s a first time for me
I’m there with jlehtone,
You remove one disk (or it just goes bad) and you reboot, and the sdx naming could be totally different,
if possible better use either the by-uuid, by-partuuid or what better suits your case
To understand what is what, the Arch Wiki always comes to the rescue