If you are using wp_set_post_tags this you can pass either
array of exiting tags id or array of string.
If it is a string then it will create a new one and assign that, if you are passing an id then it will assign that term_id of post_tag.
As per your code I can see you are passing tag’s slug and this is being treated as a string and that is why it is creating the tag again.
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