This:
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And to answer OP question: Sneak Attack is now done as separate damage instance, which btw opens up the way for lots of exploits. So when you see 1d6+3+1d6 on current Sneak Attack button, it deals 1d6+3, and then it deals another 1d6. If something modifies the damage, both damage instances are modified like they are a completely separate attacks. For example, if you have Great Weapon Master enabled, both attacks get +10. See here:

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