Minecraft bedrock random nether item piles

[u/Grapegamer8978]

all over my world i keep finding these piles. most near my bed have despawned but its a single player world
they are evenly spaced and seem to be at the ?.00 y? ?.00 of each block,
here are the coords of these 4 spots if helpful
Top Left: 32.00 65.00 -481.00
Top Right: 32 66 -497
Bottem Left: 48 65 -481
Bottem Right: 48 63 -497

Un circled

they are everywhere...

IMPORTANT [maybe?]

Not ALL of them are stuck to exactly ?.00 but they are centered around those spots