Maul the dark ages

I have identified the cause of the audio issue affecting the Wither Storm, the Withered Symbiont, and the Ender Dragon; this bug occurs when using the custom resource pack I created to change the end credits music. For now, the only way to avoid it is to enable the pack only after completing the game (i.e., after defeating the Ender Dragon). Another bug occurs when loading a resource pack (whether moving, enabling, or removing it). I have spoken with the creator of the mod that allows custom music to be added to entities; now we just have to wait for him to fix the issue.