Primed Creepers have a distinct sound compared to primed TNT, however, both the noteblock with a Creeper head on top and the Creeper "Playsound" command use the TNT primed noise. This bug affects the "playsound minecraft:creeper_primed" command, Creepers, and Noteblocks with a creeper head on top.
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We're tracking this issue in MC-257638, so this ticket is being resolved and linked as a duplicate.
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