All shaders I tried turns my world invisible. No, this isn't the shader's fault. In fact, these shaders are from different creators, so why all shaders I tried turns my world invisible? Also one of the shaders I tried is the one I used before which it works.
Render Dragon currently does not support third-party shaders, see https://help.minecraft.net/hc/en-us/articles/4408865164173-Minecraft-with-Ray-Tracing-and-Advanced-Graphics-FAQ#h_01FF6ADKQJ6MHQ11KB2F5XWX4W.
If you would like to see support for third-party shaders, please add a vote to this thread:
https://feedback.minecraft.net/hc/en-us/community/posts/360077420452-3rd-party-shader-support-for-render-dragon