Our server logs get spammed allot with the following error and warnings:

[C2ME worker #2/WARN]: Empty or non-existent pool: minecraft:

and

[C2ME worker #5/ERROR]: No key selector in MapLike[{event_delay:0,event_distance:0.0f,range:16,source:{source_entity:[I;176865803,-972338229,-2060744252,-623071664],type:"minecraft:entity",y_offset:0.36f}}]

and

[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #5/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:step_height_addition'
[C2ME worker #5/WARN]: Ignoring unknown attribute 'forge:step_height_addition'
[C2ME worker #1/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #1/WARN]: Ignoring unknown attribute 'forge:step_height_addition'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #4/WARN]: Ignoring unknown attribute 'forge:step_height_addition'
[C2ME worker #3/WARN]: Ignoring unknown attribute 'forge:entity_gravity'
[C2ME worker #3/WARN]: Ignoring unknown attribute 'forge:step_height_addition'

Anything to worry about? I'm using Fabric 1.20.1

This is coming from your world generation mods rather than C2ME. Please contact the corresponding mod authors for support.