The link to item trash in Dashboard is this:
/administrator/index.php?option=com_k2&view=items&filter_view=0

But should be this?:
/administrator/index.php?option=com_k2&view=items&filter_trash=1

I used this link to access the trash but then when I clicked back on "items" it took me to the trash again. I had to logout and log back in to access my items

Hi. Fixed in v2 final. Thanks for reporting this issue to us.