I'd like to use these mods together, but the compatibility between the two mods seems exclusive to 1.19. Would you mind at least getting that into 1.18 please? Thanks in advance.

That would need to be done for both MoreCulling and CullLessLeaves. I'm currently too busy to do that

New 1.18.x branch will fix this issue. Although CullLessLeaves will have to also backport the compatibility

Oh, thank you so much.