From 1982 to date these coins where made out of zinc plated with copper. What you have here in my opinion is a gas bubble or corrosion that has developed under the plating.
It could well be a gas bubble, but would be an unusual one...it's small, tall, and sharply shaped - which indicates gouge more than gas bubble.
Being that it's at the edge of the design, in the right place for split plating, and does have split plating to the right of it, a gas bubble is a realistic possibility.
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