Your plugin is conflicting with others in 5.5. Classic editor is not working properly since the update if people have your plugin activated. Featured image is also not working properly in Block editor. When you click on it you just have a blank page. I personally downgraded to 5.4.2 to solve the problem in emergency. Others deactivated your plugin. I am a journalist, I have no time to do a huge series of test to see where the problem is.
