Hello.
I have identified the problem.
When the type of Input Render Texture is set to "Texture" of "Object Type", it can be set as a variable, but when the type is set to "Texture", the variable cannot be selected as Input Render Texture. However, when the type is set to "Texture", the variable cannot be selected as Input Render Texture.
Now I am trying to create a Render Texture with Create Render Texture and set it as the Input Render Texture variable in Render Texture To Texture 2D as shown in the figure. However, the Render Texture created with Create Render Texture is of type "Texture" and cannot be set to the Input Render Texture variable in Render Texture To Texture 2D.
Do you have any advice on how to fix this?