Files are turning read only when dragging to desktop.
This has been happening for a while now, certainly since I updated to Sequoia.
When I drag files from the below areas, they sometimes turn read only. I can't change the name of the filename and the OS says they will be deleted immediately when command-deleting them.
When I Cmd-I the document: The permissions are correct for my account (Read-Write), Staff (Read only), Everyone (Read only)
Dragging attachments from Mail to Desktop -> the files are always read only.
Saving attachments from mail to Desktop -> the files aren't read only.
Dragging from iCloud to Desktop -> When dragging (i.e. moving) to Desktop they aren't read only.
However when I Opt-drag to make a copy to desktop, they are always read only.
This is causing me major problems and I've lost files due to this (as I'm used to seeing the 'deleted immediately' dialog now and I deleted the wrong file).
Any idea what is causing this?
Mac mini (M2 Pro, 2023)