Add some Paper fixes

[MicrocontrollersDev]

These fixes are taken from Paper patches created by people who have licensed their code as MIT. While Paper itself is under GPL, which I believe means we cannot use any of their code as this project is LGPL (correct me if I'm wrong), these fixes are all under MIT as Paper allows you to do that (see https://github.com/PaperMC/Paper/blob/main/LICENSE.md). I've gone through these contributors and directly ported their fixes here.