Items not despawning?

Hello!

So I am having a bit of an issue with items that don’t despawn in the world. They seem to take an extremely long time to despawn, even when the chunk is loaded. And in most cases, they don’t despawn at all until I am near them for a period of time.
I am unsure if it is a plugin that may be causing this, or if SpongeForge (or its configurations) isn’t working properly.

I currently use SpongeForge 5.2.0-BETA-2353.
I use GriefPrevention (1.10.2 v2.3.1.295) and Luckperms (3.2.7) as my only plugins.