PaperMC/paper-server/nms-patches/net/minecraft/world/level/block/BlockFungi.patch

--- a/net/minecraft/world/level/block/BlockFungi.java
+++ b/net/minecraft/world/level/block/BlockFungi.java
@@ -74,6 +74,13 @@
     @Override
     public void performBonemeal(WorldServer worldserver, RandomSource randomsource, BlockPosition blockposition, IBlockData iblockdata) {
         this.getFeature(worldserver).ifPresent((holder) -> {
+            // CraftBukkit start
+            if (this == Blocks.WARPED_FUNGUS) {
+                BlockSapling.treeType = org.bukkit.TreeType.WARPED_FUNGUS;
+            } else if (this == Blocks.CRIMSON_FUNGUS) {
+                BlockSapling.treeType = org.bukkit.TreeType.CRIMSON_FUNGUS;
+            }
+            // CraftBukkit end
             ((WorldGenFeatureConfigured) holder.value()).place(worldserver, worldserver.getChunkSource().getGenerator(), randomsource, blockposition);
         });
     }