There are two separate issues that I've been experiencing with the 3.0.0 version of the mod. I don't know if this was patched in the 4.0.0 version, but I do want to ask if you can fix them in the 1.16.5 release so I can continue using the Slime Origin mod in my modpack without needing to wait for everything else to update. They both related to the Pehkui mod, though one is more obvious with the related White Rabbit mod. This is the first issue.

This bug is that the origin is incompatible with Pehkui's config option to keep modified scales upon respawn. If the player actually dies and respawns, they will appear to be permanently set to zero(?) size, constantly clipping into the ground block. Going into third person reveals no player model. This is impossible to fix with a resizing command or further deaths, and requires an entire player data reset to fix. I do imagine making this compatible would be difficult due to not wanting players to respawn at the smallest size, but maybe you can give another forced size change upon actual death to compensate?

I only just noticed that this was originally a bug that was fixed in the 1.1.1 version, but the failsafe you implemented since then has broken way beyond what you originally intended.