I have just had this same problem
Trash showing empty and when I right click on a file and select move to trash
it says that Trash has reached its max. limit
I unlocked Widgets - right clicked on the Trash can - clicked on TrashCan settings -
Removed the check mark for Limit to Maximum Size.
Now I can right click on the file and send it to the Trash
EDIT: after sending the file to the Trash, then emptying the Trash Can, I added back the check mark for
Limit to maximum size.
Now the Trash works as it should.