Sometimes projectiles pass through mobs. This bug seems to happen more at close range, and can seriously mess up both Survival and PvP.
This is a major bug that should absolutely be prioritized for the 1.16.4 update.
Video demonstration (happens at 0:32): https://www.youtube.com/watch?v=bdnqi0VzACY&feature=youtu.be
NOTE: Though this was tested on a realm against players I can confirm this happens with any entity even in single player
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So you're asking me to take a screenshot in any world in vanilla 1.16.3, as if that would prove literally anything?

Can you provide a video of this happening. If the video is to big you can upload it onto YouTube as unlisted the post the link here
Also, if you didn't know, reports using modified game is invalid so proving you're in vanilla DOES prove something

Oh trust me I know that now
Duplicate of MC-214546.
Since MC-214546 got triaged, we'll be tracking this issue over there. Thank you for reporting!
Are you sure you are using 1.16.3? Please provide a screenshot of your game with the F3 debug screen enabled in a world/server this issue occurs in.