What is Z-fighting?
Z-fighting is when 2 faces of a block, item, entity etc. are on similar or the same coordinates. The game doesn't know which one to render over the other so it attempts to render both at the same time which makes the textures clip through each other, producing a flickering effect that looks bad and can even strain the eyes if it's intense. Some models and textures either have not accounted for z-fighting or haven't separated the faces far enough. This pack fixes a ton of these issues with mainly model files and a few texture files.

Most of the entity fixes require OptiFine.

I cannot guarantee compatibility with other packs but it should be compatible with most small vanilla packs and other packs that don't make large changes to models.

This pack should be put under other packs most of the time to avoid compatibility issues.

The pack is not done, there are some more fixes to add but I've added the most notable ones, the rest are a lot harder to notice (or just can't be fixed by me).

There are a few things that I cannot add due to limitations of resource packs and OptiFine such as anything player model related

All Z-Fighting Fixes Included:

Iron bars with ground and ceiling
Floating flickering pixels to the sides of reins on armored horse
Piglin and zombified piglins' legs
Cat tail and body when running
Sign post when placed on another sign
Item frame and pressure plate (+ carpet and rails)
Vertical fire and block from a distance
Enchanting book cover and pages from a distance
Map item frames from a distance
Villager taiga outfits by neck
Panda head and body
Drowned head and torso and legs
Skeleton legs and pelvis
Sign with block on top
Pig legs and body when walking
Spider's legs
Horse ears and head
Seagrass against block at certain coordinates
Armor stand holding spyglass
Anvil in item frame and torch
Small armor stand head and shoulders
Hanging root when held in hand
Connected fence and lead knot from below
Bat head and body when hanging on ceiling
Boat floors when up against trapdoors, snow layers and end portal frames with an eye of ender in it
Minecart against block
Dispensed boat against dispenser
Different colored shulkers when opened and next to each other
Snow golem pumpkin and body
Chicken beak and head (internal)
Small pufferfish eyes (internal)
Villager head and body (internal)
Lever and buttons with items in item frame
Pressed button and painting
Item frame and block from underneath
Wall posts and the connecting parts from below and above when glass blocks are on top of them
Parrot tail and body
Skeleton horse skull inside and reins
Bamboo raft when pushed into slab
Button and item in item frame
Banner top in item frame
Spawners, trial spawners, and vaults when next to blocks
Mob feet when using shaders
Armor models
Bottoms of heads when wearing mob heads
Inside of skulls when on a wall