I made an old TNT using /setblock ~ ~ ~ tnt 1, a tnt that will explode when breaking. But when I breaked it in survival mode, it dropped a tnt and exploded. So I got two tnt: one that exploded and one dropped.
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It's normally. Try /setblock ~ ~ ~ tnt.

Yea, but making it with a damage value of 1 makes a TNT drop AND an explosion.
Confirmed.
Also duplicate of MC-59517.