SAX changes air to stone for no reason

[SansSerif1]

Hi!
I own an All Of Fabric 3 modded server, and ran into issue with this mod.
My blocks.json looks like this:
{ "minecraft:coal_ore": "minecraft:stone", "minecraft:lapis_ore": "minecraft:stone", "minecraft:mossy_cobblestone": "minecraft:stone", "minecraft:spawner": "minecraft:cave_air", "minecraft:nether_gold_ore": "minecraft:netherrack", "minecraft:emerald_ore": "minecraft:stone", "minecraft:ancient_debris": "minecraft:netherrack", "minecraft:iron_ore": "minecraft:stone", "minecraft:nether_quartz_ore": "minecraft:netherrack", "minecraft:redstone_ore": "minecraft:stone", "minecraft:gold_ore": "minecraft:stone", "minecraft:diamond_ore": "minecraft:stone", "appliedenergistics2:quartz_ore": "minecraft:stone", "appliedenergistics2:charged_quartz_ore": "minecraft:stone", "techreborn:bauxite_ore": "minecraft:stone", "techreborn:cinnabar_ore": "minecraft:netherrack", "techreborn:copper_ore": "minecraft:stone", "techreborn:galena_ore": "minecraft:stone", "techreborn:iridium_ore": "minecraft:stone", "techreborn:lead_ore": "minecraft:stone", "techreborn:peridot_ore": "minecraft:end_stone", "techreborn:pyrite_ore": "minecraft:netherrack", "techreborn:ruby_ore": "minecraft:stone", "techreborn:sapphire_ore": "minecraft:stone", "techreborn:sheldonite_ore": "minecraft:end_stone", "techreborn:silver_ore": "minecraft:stone", "techreborn:sodalite_ore": "minecraft:end_stone", "techreborn:sphalerite_ore": "minecraft:netherrack", "techreborn:tin_ore": "minecraft:stone", "techreborn:tungsten_ore": "minecraft:end_stone", "byg:ametrine_ore": "minecraft:stone", "byg:pendorite_ore": "minecraft:stone", "byg:anthracite_ore": "minecraft:stone", "byg:lignite_ore": "minecraft:stone", "byg:cryptic_redstone_ore": "minecraft:stone", "cinderscapes:sulfur_ore": "minecraft:netherrack", "cinderscapes:sulfur_quartz_ore": "minecraft:netherrack", "cinderscapes:rose_quartz_ore": "minecraft:netherrack", "cinderscapes:smoky_quartz_ore": "minecraft:netherrack", "cinderscapes:ender_ore": "minecraft:end_stone", "cinderscapes:amber_ore": "minecraft:end_stone", "cinderscapes:thallasium_ore": "minecraft:end_stone", "indrev:nikolite_ore": "minecraft:stone", "lightstones:lightstone_ore": "minecraft:stone", "lightstones:blightstone_ore": "minecraft:netherrack", "modern_industrialization:antimony_ore": "minecraft:stone", "modern_industrialization:fluorite_ore": "minecraft:stone", "modern_industrialization:iridium_ore": "minecraft:stone", "modern_industrialization:lignite_coal_ore": "minecraft:stone", "modern_industrialization:mozanite_ore": "minecraft:stone", "modern_industrialization:nickel_ore": "minecraft:stone", "modern_industrialization:platinum_ore": "minecraft:stone", "modern_industrialization:quartz_ore": "minecraft:stone", "modern_industrialization:salt_ore": "minecraft:stone", "modern_industrialization:titanium_ore": "minecraft:stone", "modern_industrialization:tungsten_ore": "minecraft:stone", "modern_industrialization:uranium_ore": "minecraft:stone", "croptosis:appatite_ore": "minecraft:stone", "croptosis:potash_ore": "minecraft:stone", "mysticalagriculture:prosperity_ore": "minecraft:stone", "mysticalagriculture:inferium_ore": "minecraft:stone", "mysticalagriculture:soulium_ore": "minecraft:soul_sand" }

And for some reason, the air is replaced with stone. It dissapears by the time after looking at it or interacting with it, but still, it should not do that. May I ask, is it by my blocks.json, or is the mod broken?