Currently, this is a default behavior that does not override to default values for values that already exist.
Another alternative option I can give is using column formatting with JSON to set the value of that column to the default value you set, which can keep the value of the column at the default value, but only change the style, not for the real property, and only work for this view.
Hope this helps. Best Wishes.
{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "a",
"txtContent": "1",
"attributes": {
"target": "_blank"
}
}
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