If it's possible to add to the idea of "mobs seeing you through walls"
that counts as them looking at the player, if so I have a video I made with evidence on a creative world where I spawned in a lot of creepers, put them in a pen and made a wall in between us. I didn't jump above the wall.
Reproduction : Make wall, spawn mobs on other side, look at the wall where the mobs are, and they will look and follow you with their head, they will not move towards you, they will only follow your movement.
(1.16.40 Hotfix) Can confirm, the only particles you see are the effects you get from the totem however you don't see any of those green/yellow particles.
If it's possible to add to the idea of "mobs seeing you through walls"
that counts as them looking at the player, if so I have a video I made with evidence on a creative world where I spawned in a lot of creepers, put them in a pen and made a wall in between us. I didn't jump above the wall.
Reproduction : Make wall, spawn mobs on other side, look at the wall where the mobs are, and they will look and follow you with their head, they will not move towards you, they will only follow your movement.
https://youtu.be/Es3DcY4KlRQ
(1.16.40 Hotfix) Can confirm, the only particles you see are the effects you get from the totem however you don't see any of those green/yellow particles.
Step 1: Download a hacked client / Injector that allows you to enchant any item possible.
Step 2: Enchant a shulker box (may be full or empty)
Result : Visual Glitch in hotbar/inventory.