Rapid flickering with optifabric.

[CJ3000g]

i wanted to be able to use optifine as well as fabric mods when playing minecraft however when i do i get constant flickering that makes the game very hard to play. any help would be greatly appreciated. i'm using "preview_OptiFine_1.15.2_HD_U_G1_pre23"

[0xfeeddeadbeef]

I'd suggest upgrading to preview_OptiFine_1.15.2_HD_U_G1_pre30 and see what happens.