diff --git a/prismarine-viewer/viewer/lib/mesher/models.ts b/prismarine-viewer/viewer/lib/mesher/models.ts
index 8b9115e79..c7bce0c0d 100644
--- a/prismarine-viewer/viewer/lib/mesher/models.ts
+++ b/prismarine-viewer/viewer/lib/mesher/models.ts
@@ -479,15 +479,32 @@ export function getSectionGeometry (sx, sy, sz, world: World) {
           // cache
           let { models } = block
           if (block.models === undefined) {
+            const props = block.getProperties()
             try {
+              // fixme
+              if (world.preflat) {
+                if (block.name === 'cobblestone_wall') {
+                  props.up = 'true'
+                  for (const key of ['north', 'south', 'east', 'west']) {
+                    const val = props[key]
+                    if (val === 'false' || val === 'true') {
+                      props[key] = val === 'true' ? 'low' : 'none'
+                    }
+                  }
+                }
+              }
+
               models = blockProvider.getAllResolvedModels0_1({
                 name: block.name,
-                properties: block.getProperties(),
+                properties: props,
               })!
-              if (!models.length) models = null
+              if (!models.length) {
+                console.debug('[mesher] block to render not found', block.name, props)
+                models = null
+              }
             } catch (err) {
               models ??= erroredBlockModel
-              console.error(`Critical assets error. Unable to get block model for ${block.name}[${JSON.stringify(block.getProperties())}]: ` + err.message, err.stack)
+              console.error(`Critical assets error. Unable to get block model for ${block.name}[${JSON.stringify(props)}]: ` + err.message, err.stack)
               attr.hadErrors = true
             }
           }
diff --git a/src/preflatMap.json b/src/preflatMap.json
index fdf2640ff..81c2a20a4 100644
--- a/src/preflatMap.json
+++ b/src/preflatMap.json
@@ -925,18 +925,18 @@
         "143:11": "oak_button[face=wall,facing=south,powered=true]",
         "143:12": "oak_button[face=wall,facing=north,powered=true]",
         "143:13": "oak_button[face=floor,facing=north,powered=true]",
-        "144:0": "undefined[facing=down,nodrop=false]",
-        "144:1": "undefined[facing=up,nodrop=false]",
-        "144:2": "undefined[facing=north,nodrop=false]",
-        "144:3": "undefined[facing=south,nodrop=false]",
-        "144:4": "undefined[facing=west,nodrop=false]",
-        "144:5": "undefined[facing=east,nodrop=false]",
-        "144:8": "undefined[facing=down,nodrop=true]",
-        "144:9": "undefined[facing=up,nodrop=true]",
-        "144:10": "undefined[facing=north,nodrop=true]",
-        "144:11": "undefined[facing=south,nodrop=true]",
-        "144:12": "undefined[facing=west,nodrop=true]",
-        "144:13": "undefined[facing=east,nodrop=true]",
+        "144:0": "player_head[facing=down]",
+        "144:1": "player_head[facing=up]",
+        "144:2": "player_head[facing=north]",
+        "144:3": "player_head[facing=south]",
+        "144:4": "player_head[facing=west]",
+        "144:5": "player_head[facing=east]",
+        "144:8": "player_head[facing=down]",
+        "144:9": "player_head[facing=up]",
+        "144:10": "player_head[facing=north]",
+        "144:11": "player_head[facing=south]",
+        "144:12": "player_head[facing=west]",
+        "144:13": "player_head[facing=east]",
         "145:0": "anvil[facing=south]",
         "145:1": "anvil[facing=west]",
         "145:2": "anvil[facing=north]",