I'm still new to forum posting, but I've noticed with campfires on 1.17.1, they would glitch out and be seen through everything, though I'm not sure if this will apply to any other particle effects, and all I know is that it doesn't happen in the base game, only in forge 1.17.1!
Edit: For clarification, it's the smoke effect from the campfire!
Again I'm sorry if this breaks rules, but I just wanted to let ya know since it made some impacts on game performance too for rendering! 🥰