my game can't load resource pack more than 256x256px images

but it works well with fabric client just not for vanilla tho if it's more than 256x256

        {
            "type": "bitmap",
            "file": "minecraft:titles/stradanetwork512.png",
            "ascent": 9,
            "height": 40,
            "chars": [""] #f8fe#titles
        },

        {
            "type": "bitmap",
            "file": "minecraft:titles/stradanetwork512.png",
            "ascent": 9,
            "height": 40,
            "chars": [""] #f8fe#titles
        },