Question [1.18.2] Custom heads with BlockPopulator apears as Steve head

[KnusperflockeOfDeath]

I try to generate custom trees and other structures with custom heads.
Here is the code:

BlockState state = region.getBlockState(pos);
// CompoundTag from net.minecraft.nbt with mojang-mappings
CompoundTag nbt = stateData[x + z * size.getBlockX() + y * size.getBlockX() * size.getBlockZ()];
if (nbt == null) {
    Log.consoleDebug("NBT is null: %s".formatted(pos.toString()));
    continue;
}

if (state instanceof Skull) {
    Skull skull = (Skull) state;

    // seperated for debugging purpose
    CompoundTag skullOwner = nbt.getCompound("SkullOwner");
    CompoundTag properties = skullOwner.getCompound("Properties");
    ListTag textures = properties.getList("textures", CompoundTag.TAG_COMPOUND);
    CompoundTag texture = textures.getCompound(0);
    String textureBase64 =texture.getString("Value");

    // PlayerProfile, ProfileProperty from com.destroystokyo.paper.profile
    PlayerProfile profile = Bukkit.createProfile(UUID.randomUUID(), "___");
    profile.setProperty(
            new ProfileProperty("textures", textureBase64)
    );
    skull.setPlayerProfile(profile);
    region.scheduleBlockUpdate(pos);
}

The Problem is that every head is a steve head. The only exception that occured was, if the head is inside the spawn chunk radius then it is an alex head.
I debugged the code since a week and don't get the wrong place. I searched on the internet but there are no information about spawning an custom head in an chunkgenerator nor blockpopulator.

 

[KnusperflockeOfDeath]

After I post this I recognized the failure.
I missed region.setBlockState(pos, skull); because i thought the state is a reference and not a copy.