The Bug:

Some entities don't produce particles while moving inside of powder snow.

Affected Entities:

Here is a table of all of the entities in the game, that do or do not produce particles while they're inside of powder snow. I've also provided an additional row which states whether this is most likely intentional or not, as some of these entities have no motion.

Before reading the table, please note the following:

• = No.
• = Yes.

Entity	Produces Particles?	Possibly Intentional?	Notes
area_effect_cloud			This entity does not have any motion by default, therefore making it most likely intentional.
armor_stand
arrow		-
axolotl
bat
bee
blaze
boat		-
cat
cave_spider
chest_minecart
chicken
cod
command_block_minecart
cow
creeper
dolphin
donkey
dragon_fireball
drowned
egg
elder_guardian
end_crystal			This entity does not have any motion by default, therefore making it most likely intentional.
ender_dragon			This entity destroys powder snow as it moves through it so no particles should be produced.
ender_pearl
enderman
endermite
evoker
evoker_fangs
experience_bottle
experience_orb			Experience orbs producing particles in powder snow is not intended and is being tracked in MC-221309.
eye_of_ender
falling_block			As of snapshot 21w05a, blocks can no longer fall through powder snow.
fireball
firework_rocket		-
fox
furnace_minecart
ghast		-
giant
glow_item_frame			This entity does not have any motion by default, therefore making it most likely intentional.
glow_squid		-
guardian
hoglin
hopper_minecart
horse
husk
illusioner
iron_golem
item
item_frame			This entity does not have any motion by default, therefore making it most likely intentional.
leash_knot			This entity does not have any motion by default, therefore making it most likely intentional.
lightning_bolt			This entity does not have any motion by default, therefore making it most likely intentional.
llama
llama_spit
magma_cube
minecart
mushroom
mule
ocelot
painting			This entity does not have any motion by default, therefore making it most likely intentional.
panda
parrot
phantom		-
pig
piglin
piglin_brute
pillager
polar_bear
potion
pufferfish
rabbit
ravager
salmon
sheep
shulker
shulker_bullet
silverfish
skeleton
skeleton_horse
slime
small_fireball
snow_golem
snowball
spawner_minecart
spectral_arrow		-
spider
squid		-
stray
strider		-
tnt
tnt_minecart
trader_llama
trident		-
tropical_fish
turtle
vex
villager
vindicator
wandering_trader
witch
wither
wither_skeleton
wither_skull
wolf
zoglin
zombie
zombie_horse
zombie_villager
zombified_piglin

Steps to Reproduce:

1. Summon a large area of powder snow by using the command provided below.

   /fill ~1 ~ ~1 ~15 ~4 ~15 minecraft:powder_snow

2. Summon any affected entity as listed above and make them move through the powder snow.
3. Take note as to whether or not some entities don't produce particles while moving inside of powder snow.

Observed Behavior:

Some entities don't produce particles while moving inside of powder snow.

Expected Behavior:

All appropriate entities would produce particles while moving inside of powder snow.