allow custom renderers to draw on multiple layers

fix extra leaves & fast graphics xray bug

src/main/kotlin/mods/betterfoliage/client/render/RenderCactus.kt

@@ -95,6 +95,9 @@ class RenderCactus : AbstractBlockRenderingHandler(BetterFoliageMod.MOD_ID) {
         Config.blocks.cactus.matchesClass(ctx.block)
 
     override fun render(ctx: BlockContext, dispatcher: BlockRendererDispatcher, renderer: VertexBuffer, layer: BlockRenderLayer): Boolean {
+        // render the whole block on the cutout layer
+        if (!layer.isCutout) return false
+
         // get AO data
         modelRenderer.updateShading(Int3.zero, allFaces)
         val icons = cactusTextures[ctx.blockState(Int3.zero)] ?: return renderWorldBlockBase(ctx, dispatcher, renderer, null)