update_post_meta is maybe_serialising.
And in this case is storing it as a serialised string
The string your passing isn’t a correctly serialised array.
If you pass it the raw array it will self convert it to the correct serialised string.
The correct string is a:1:{i:0;s:4:”test”}, passing that shouldn’t serialise but probably will. You are betted off passing in the array as an array
If you want to store an already serialised object, direct Database write.
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