Post thumbnail shows blank

after update to wordpress 5.5,new post thumbnail images shows blank
and i tested with disable all plugins and enable one by one
find easy watermark cause this problem,it adds ?v=1596978727 to thumbs src,so images can’t show right(like https://www.yunglobe.com/wp-content/themes/sky1.0/timthumb.php?src=https://www.yunglobe.com/wp-content/uploads/2020/08/The-Top-5-Ways-to-Prove-the-Real-Value-of-SEO-760×400-1.png?v=1596978727&h=150&w=242&q=90&zc=1&ct=1 )
could you fix and update your plugin?thanks