I've used the following solution (trial and error):
- Multi select the files with the red error marks
- Right-click and select 'Free up space' (this will mark these files to be kept online only)
- Right-click again and select 'Always keep on this device' (now the mark will change to a solid green checkmark)
- Right-click again and select again 'Always keep on this device' (to toggle it off).
In my case, these files now show the normal green/white checkmark. Hope it helps for you (just try it first for one file).