Why does this SQL stored procedure break when you add a column?

Why does this SQL stored procedure break when you add a column. The SQL code uses SELECT * in a procedure. In SQL the result shape changes on schema change. In SQL procedures that call it crash.

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https://www.youtube.com/watch?v=0tiKd1P5qXQ

Why does this SQL stored procedure break when you add a column? #sqlreliability

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