Illusioner Illusions

I found that when an Illusioner creates Illusions the Illusions sometimes stack in the same location until damaged. Also the Illusioner is not at one of the Illager Illusions but it is an invisible enitity. The Invisible Illusioner also does not change locations when damaged. When the Illusioner creates illusions it gets a very high speed effect. I believe that it is intended for the Illusions to be able to pass through walls, but I do not know for sure. For all of these I am unsure whether or not they are features or bugs.