Login items not being retained

It used to be that OneDrive opened automatically for me on login.

Since updating to 13.3.1 about 2 weeks ago, this stopped happening, so I added it again under system settings/general/login items.

The machine holds this information for a day or two then I power up to work again and OneDrive is no longer shown. Has been removed from the dock and from the login items list.

I add it again and a couple of days later, it will disappear again.

The only other item which opens on login is Google Chrome and that is not affected.

Anyone any ideas what's going on?