OptiFine_1.21.6_HD_U_J6_pre3

 - not working: shaders, AA/AF, render regions
 - fixed alternate blocks
 - fixed emissive magma blocks (#7928)
 - fixed vanilla shaders patch for dynamic lights, alpha cutout
 - fixed fog
 - fixed CIT texture parsing, crash with shield textures
 - fixed better grass and smart leaves
 - updated to 1.21.6
 - not compatible with Forge
(29.06.2025)