I've tried editing the manifest.json file of the addon, but that doesn't seem to fix it. There are only so many addons for 1.20.80 available, and I hope they fix this. One thing they could do is remove the missing texture square and change it to one of those resource/behavior pack error messages on the top of the screen upon joining. Some packs work perfectly, but have the square on the screen.
I've tried editing the manifest.json file of the addon, but that doesn't seem to fix it. There are only so many addons for 1.20.80 available, and I hope they fix this.
One thing they could do is remove the missing texture square and change it to one of those resource/behavior pack error messages on the top of the screen upon joining. Some packs work perfectly, but have the square on the screen.