Material names are not matching every Bukkit version, for instance EYE_OF_ENDER should be ENDER_EYE for 1.13+
EYE_OF_ENDER
ENDER_EYE
fixed ages ago
Material names are not matching every Bukkit version, for instance
EYE_OF_ENDERshould beENDER_EYEfor 1.13+fixed ages ago