Zombified Piglins killed instantly with a Smite V Netherite sword do not cause others to become aggressive

When a zombified piglin is killed with a fully charged Netherite Smite V sword the other zombified piglins in the area do not become hostile.

 

Hi I've been playing normal survival and encountered this bug. It might be because the game never expected them to be one hit. It's a repeatable bug on both 1.16.5 and the snapshot. Pictures are included but it's difficult to show without a video, thank you for reading.