The behavior when Triggers contain non-alphabetical characters

[gaoqiangks]

I have a vscode type snippet file a.json as the following.

{
    "test{}": {
        "prefix": "test",
        "body": [
            "This is test"
        ],
        "luasnip": {
            "priority": 6000
        }
    },
    "*test{}": {
        "prefix": "*test",
        "body": [
            "This is *test"
        ],
        "luasnip": {
            "priority": 6000
        }
    }
}

How to make *test trigger the second snippet? If I type *test, then the first snippet might be triggered, namely, *test -> *This is test. Sometimes the first one is triggered, and sometimes the second one is trigger (The behavior is consistent in a session, but not if I restart neovim). However, I want to always trigger the second snippet, how to achieve this?