When using the latest 1.18.2 versions of Origins (1.4.1) and Requiem (2.0.0 beta9) together, possessing any mob increases your swimming speed drastically. Specifically, when moving in water with mobs that are not supposed to be able to move well in water (such as iron golems and skeletons), you move incredibly fast, faster than mobs that are supposed to be able to move well in water (although you are still not able to float with said mobs, the water movement speed alone is what seems to be affected).

This issue persists with/without using dependent libraries for either mod (cloth config, satin api, playerabilitylib, etc.), and with/without using addons for Origins and Requiem (extra origins, pandemonium expansion, etc.). However, this issue does not persist when using Requiem without the Origins mod.

I am unsure if this is an incompatibility issue on Requiem's or Origin's side, but any possessed mob's swim speed works fine when Origins is not installed with Requiem, so I assume it's some conflicting issue with Origins.