This is due to Minecraft's codebase improving over the years and OptiFine's aggressiveness towards replacing entire swaths of code while being closed source making it very difficult to figure out why OptiFine has broken another modder's mod. However, over the years, its benefits have dwindled and has caused many issues for modders. OptiFine was originally a great mod offering many quality of life improvements for the player in the beginning. OptiFine Alternatives OptiFine Alternatives Why?
