Just hook.add the SW_ADDON:Think() function then you can throw the SW_ADDON out. Move the file to autorun after that.

SW_Addons.AutoLoadAddon() is used for the base to detect the lua file and loads it to give it a SW_ADDON instance. It has to be at the top or the stript will break. The code we have done is accually quite untypical for gmod standards.

I think your way of debugging it is quite the right path on getting down to the issue. I think something with EF_BONEMERGE or the "models/sligwolf/unique_props/nodraw" material is causing the side effect.

x86-64 branch, glitched:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3307783839

main branch, working fine:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3307784352



Train addon, x86-64, broken:
https://www.youtube.com/watch?v=O-C7Hg2PPeA

Prop Train, x86-64, broken, older video:
https://www.youtube.com/watch?v=Q1On4M3_hP4

Train addon, main, working fine:
https://www.youtube.com/watch?v=Sr2HsiQcRmE