Conflicts with Avatar block – can’t add border radius

For some reason this plugin prevents me from adding a border-radius to the Avatar block in Twenty Twenty Three (and presumably any FSE theme).

I tested with a clean installation and this plugin only.

Adding a border radius to the Avatar block with the block editor, in template editing, isn’t saved to the template and as such have no effect.

(Adding a border radius to the Avatar block in global styles work, but it can’t be customised for individual templates.)