In the requiem mod, when you die, you become a ghost. As a ghost you can possess dead mobs and here lies the problem.
When you possess a mob while having a figura avatar, the mob becomes overlaid on top of the camera.

I also had the game crash one time when you equip a piece of armor, but I haven't been able to reproduce it (it could also be another mod that crashed the game, and I was too stupid to keep the error logs).

Feel free to ask more question, as long as I can help

here is some other information:
game version: fabric 0.14.21 for MC 1.18.2
figura version: 0.1.0+1.18.2-31401ed
requiem version: 2.0.0-beta.8

this is an incompatibility on requiem side, as they are not setting the camera entity to the possessed entity, causing this code to run

the way requiem is blocking the entity from rendering is here, were Figura runs the same mixin first, causing this to execute first
(update: ok that part seems unrelated)

a workaround for it would be disabling first person matrices in figura settings

Thanks for the quick response, I will open an issue at requiem's repo and ask to implement a solution.
Don't delete this issue, as I will link this in the new issue.

As for the other issue of the game crashing when equipping an armor piece, it seems to be a common issue with the requiem mod as well.
Link to issue

Thanks for the quick response, I will open an issue at requiem's repo and ask to implement a solution.

Don't delete this issue, as I will link this in the new issue.

As for the other issue of the game crashing when equipping an armor piece, it seems to be a common issue with the requiem mod as well.

Link to issue

I see my report was mentioned; hope you can get attention to this issue so it can be fixed

Also hope that Requilium mixins get updated or something. It's causing problem with running some mods without having some others in place for some reason