[MC-246249] The legs of many entities aren't mirrored

The Bug:

Throughout the game, the legs of many entities aren't mirrored.

Below, I've constructed a table that highlights all of these errors. Please note that there may be more entities affected by this that aren't listed below.

Entity	Are their legs mirrored?	Ticket	Notes	Screenshot Example
minecraft:axolotl	No	N/A	Can only be seen when using a 32-bit (or higher-quality) resource pack.	axolotl.png
minecraft:cat	No	~~MC-242683~~		cat.png
minecraft:cave_spider	No	~~MC-127885~~		cave_spider.png
minecraft:chicken	No	N/A	Can only be seen when using a 32-bit (or higher-quality) resource pack.	chicken.png
minecraft:cow	No	N/A		cow.png
minecraft:creeper	No	N/A		creeper.png
minecraft:ender_dragon	No	N/A		ender_dragon.png
minecraft:goat	No	N/A		goat.png
minecraft:llama	No	N/A		llama.png
minecraft:mooshroom	No	N/A		mooshroom.png
minecraft:ocelot	No	~~MC-242683~~		ocelot.png
minecraft:panda	No	N/A		panda.png
minecraft:parrot	No	N/A	Can only be seen when using a 32-bit (or higher-quality) resource pack.	parrot.png
minecraft:pig	No	N/A		pig.png
minecraft:piglin	No	~~MC-186123~~		piglin.png
minecraft:piglin_brute	No	~~MC-186123~~		piglin_brute.png
minecraft:polar_bear	No	N/A		polar_bear.png
minecraft:rabbit	No	N/A		rabbit.png
minecraft:sheep	No	N/A		sheep.png
minecraft:spider	No	~~MC-127885~~		spider.png
minecraft:trader_llama	No	N/A		trader_llama.png
minecraft:wolf	No	~~MC-230603~~		wolf.png
minecraft:zombified_piglin	No	~~MC-186123~~		zombified_piglin.png

Steps to Reproduce:

Download the attached resource pack (if necessary) to make testing this much easier. MC-246249.zip
Summon any of the entities listed above, for example, a cow.

/summon minecraft:cow ~ ~ ~ {NoAI:1b,Silent:1b}

Look at the entity's legs closely.
Take note as to whether or not the legs of many entities are mirrored.

Observed Behavior:

The legs aren't mirrored.

Expected Behavior:

The legs would be mirrored.