Legend of Notch 1.5.1 on Prism Launcher entity graphics issue

I got the Legend of Notch mod for 1.5.1 running on Prism Launcher using the custom jar. When I first booted up the game I had major graphical issues, but this was expected because this is a well known issue on versions up to 1.7. I fixed it using this patch: https://github.com/BTW-Community/Graphics-Bug-Fixer

After that I booted the game up again and those graphical issues were fixed except for the mobs. All the mobs display as black entities. Some entities even just appear invisible with only their name tag and shadow rendering. The rest of the assets from the mod work perfectly fine and from what I've tested, it's perfectly playable. There is also another issue with I hold an item, then my GUI becomes glitched. If I interact with the world while holding an item the entire world becomes glitched again until I unequip the item and interact with the world again.

Has anyone else tried to get the Legend of Notch running with Prism Launcher with all the entities loading perfectly? I wonder if this is an issue with the way I installed it or just an issue with my GPU that can't be fixed because no one made a patch for this mod specifically. I'm not sure why that would be the case because I play modded Minecraft on these older versions and the graphics patches work for everything, including modded content.

https://preview.redd.it/hcmjomuywzoe1.png?width=1280&format=png&auto=webp&s=b7ce8973f554195cde7da5e6e350ff5a481cb94f

https://preview.redd.it/la00emuywzoe1.png?width=1280&format=png&auto=webp&s=ba9c1078001ca68adf6baf7bf26e59b5a9aa06bf

https://preview.redd.it/9k1iimuywzoe1.png?width=1280&format=png&auto=webp&s=b3b7dcab502bddf742c816287778993f2d0eb3bd

https://preview.redd.it/vuhu3nuywzoe1.png?width=1280&format=png&auto=webp&s=bab955afc2b4dde635c255f817d94fd2b9ffb5a9

https://preview.redd.it/khrl7quywzoe1.png?width=1280&format=png&auto=webp&s=1958182042c9e05f5c131512a98d545bc19e7fb2

https://preview.redd.it/bpdbntuywzoe1.png?width=1280&format=png&auto=webp&s=cc79b9a906a66621319a2b8221701a5ba7456bb4

After holding the rotten flesh

After opening a door while holding the rotten flesh