Is clumps a client only mod or both server and client?

bcs like is this normal to have in my console?

[16:39:07] [Server thread/WARN] [minecraft/TrackedEntity]: Fetching packet for removed entity EntityXPOrbBig['entity.clumps.xp_orb_big'/1329816, l='world', x=3887.75, y=14.00, z=1009.25]
[16:39:13] [Server thread/WARN] [minecraft/TrackedEntity]: Fetching packet for removed entity EntityXPOrbBig['entity.clumps.xp_orb_big'/1330090, l='world', x=3887.70, y=14.83, z=1009.30]

I wont drop my server log as my server is a released server.

My discord name and tag is TimRambo#2020

Thanks in advanced
TimRambo

Clumps is required on both sides.