Some examples:
wooden_doors.json
{
"values": [
"minecraft:oak_door",
"minecraft:spruce_door",
"minecraft:birch_door",
"minecraft:jungle_door",
"minecraft:acacia_door",
"minecraft:dark_oak_door",
"minecraft:crimson_door",
"minecraft:warped_door",
"minecraft:mangrove_door",
"minecraft:oak_door",
"minecraft:spruce_door",
"minecraft:birch_door",
"minecraft:jungle_door",
"minecraft:acacia_door",
"minecraft:dark_oak_door",
"minecraft:crimson_door",
"minecraft:warped_door",
"minecraft:mangrove_door"
]
}
sand.json
{
"values": [
"minecraft:sand",
"minecraft:red_sand",
"minecraft:sand",
"minecraft:red_sand"
]
}
This only happens with block items, leading me to believe the issue is present with adding blocks, or anything with the ItemLike interface, as entries to item tags.
Can confirm. All item tag files duplicate their elements