why is my script giving syntax error in the command? is it correct

[shrewd sage]

world.beforeEvents.itemUseOn.subscribe((evd) => {
  const { source: player, block, itemStack: itemUsed } = evd;

  if (!itemUsed) return;

  if (flint.includes(itemUsed.typeId)) {
    if (block.permutation.matches("ecbl_bs:brazier")) {
      const blockPosition = block.location;

      system.run(() => {
        player.runCommand(`setblock ${block.location.x} ${block.location.y} ${block.location.z} ecbl_bs:brazier["ecbl_bs:light"=1]`);
        
      });
    }
  }
});```

using command in chat works, and the block permutation is placed correctly, I just needed to put it in the script but it is giving this error, without using [ ] it works

[foggy elk]

Replace = with :
-# Yes, I know it doesn't make sense, but it mostly work

...or just use native methods

[shrewd sage]

wtf

works???

why?

[foggy elk]

Funny design choice

[shrewd sage]

https://tenor.com/view/byuntear-sad-sad-cat-cat-meme-gif-25617057

[foggy elk]

*Quite inconsistent design choice