As of version 1.12.2-0.5.30, this option still defaults to 3 for "only in debug mode", but vanilla Minecraft now shows these registry names when advanced tooltips are enabled (since 1.8, albeit in a different color than EnderCore uses), leading to items showing two copies of the internal names. Images linked in the description of this issue show the result: https://github.com/mezz/JustEnoughItems/issues/1252
As of version 1.12.2-0.5.30, this option still defaults to 3 for "only in debug mode", but vanilla Minecraft now shows these registry names when advanced tooltips are enabled (since 1.8, albeit in a different color than EnderCore uses), leading to items showing two copies of the internal names. Images linked in the description of this issue show the result: https://github.com/mezz/JustEnoughItems/issues/1252