Odd rendering past normal render distance

1.21.4 running fabric
I notice weird behaviour outside the normal render perimeter and I don't quite know how to troubleshoot it. It's very noticeable with shaders and when freecaming near the edge there's this dithering the void effect.
I am playing on a server I'm running myself so I have full control over changing stuff.

Mod list
AppleSkin, BlueMap, BlueMap Marker Manager, Bobby, Borderless Fullscreen, Cloth Config v17, Controlling, Distant Horizons, Fabric API, Fabric Language Kotlin, FerriteCore, ImmediatelyFast, Inventory Sorter, Iris, Krypton, Lithium, MaLiLib, MiniHUD, Mod Menu, ModernFix, Mouse Tweaks, No Auto Iconify, No Repair Penalty, Palladium, Placeholder API, Reese's Sodium Options, Searchables, Silk (All modules), Simple Voice Chat, Sodium, Sodium Extra, Tax Free Levels, ToadLib, Tweakeroo
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