Mods made with 2025.3 causing Modrinth modpack to not launch when paired with other mods

I'm not sure if this is the same with normal modding or other modpack loaders like curseforge, but I dropped the file for my mod made in MCreator 2025.3 into my modpack on Modrinth and the game doesn't even attempt to launch or give me a crash report when other mods such as Moonlight Lib, Puzzles Lib, Friends & Foes Reforged, or Embeddium are in the modpack too. This doesn't happen with mods made with 2025.2, and happened with multiple other mods made with 2025.3, none of which have anything coded in them which would be hard for loaders to cope with. Has this problem been addressed, or is there a known way to fix this, or do I have to scrap Modrinth? Or even better is there a way to backport my MCreator mod back to 2025.2, since this isn't a problem with 2025.2 mods