Seems like the substitution rule has been ill-defined for quite a while.
https://www.ocolly.com/sports/slow-jog-cowboys-stretching-substitution-rule/article_8554194c-4f64-11ed-8e90-13845af8d084.html#:~:text=%E2%80%9CThe%20rules%20specifically%20allow%20three,in%20play%20without%20warning).%E2%80%9D
https://www.ocolly.com/sports/slow-jog-cowboys-stretching-substitution-rule/article_8554194c-4f64-11ed-8e90-13845af8d084.html#:~:text=%E2%80%9CThe%20rules%20specifically%20allow%20three,in%20play%20without%20warning).%E2%80%9D
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