Duplicates MC-194173.
When a player points their mouse at a storage block (chest, trapped chest, dispenser, dropper, hopper, etc.) then its hitbox shifts constantly. This is the same type of shift as MC-194173.
How to reproduce:
Place down a chest
Point your mouse at it
Notice that its hitbox constantly shifts
You can use any storage block, like a dropper, dispenser, trapped chest, hopper.
The player does not have to be facing north for the block's hitbox to flash; however, it is easiest to see the moved hitbox when facing north. You can still see the moved hitbox while in third person view.
Invalid report; wasn't tested correctly; duplicates MC-194173.
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Also affects the Jigsaw Block's outline (48x48 area) with fast/fancy
Usually only occurs when items are passing through the storage blocks, for example an automated storage system.

Cannot reproduce this in 20w28a. Can you make sure that neither you nor any mob nearby is picking up items (that would be MC-194173)?
Hi there!
Yeah, that seems to be it... I was unaware that MC-194173 also affected mobs picking up items, and also unaware of a bartering farm giving gold to piglins a couple hundred blocks away being loaded by another player. Sorry about that! 😞