Raid 5 showing as Read-only after rebuild

Hi All,

My Raid 5 has just been expanded to 80TB but 1 drive failed and was replaced. The rebuild has completed but i can read/write to it fine. all the drives show up as healthy but in the built-in file manager. It shows as Read Only but I can create files/ move files perfectly fine.

Any ideas on what would cause it to say Read only? as everything is working fine.

I got the same couple of times, last happened on my update to the latest alpha build. went away on its own after a reboot in my case.