diff --git a/all-is-cubes/src/inv/tool.rs b/all-is-cubes/src/inv/tool.rs
index d1c56a818..744bc649a 100644
--- a/all-is-cubes/src/inv/tool.rs
+++ b/all-is-cubes/src/inv/tool.rs
@@ -754,9 +754,11 @@ mod tests {
             });
             let transaction = tester.equip_and_use_tool(tool.clone()).unwrap();
 
+            let mut expected_cube_transaction =
+                SpaceTransaction::set_cube(Cube::ORIGIN, Some(AIR), Some(tool_block.clone()));
+            expected_cube_transaction.add_fluff(Cube::ORIGIN, Fluff::PlaceBlockGeneric);
             let expected_cube_transaction =
-                SpaceTransaction::set_cube([0, 0, 0], Some(AIR), Some(tool_block.clone()))
-                    .bind(tester.space_ref.clone());
+                expected_cube_transaction.bind(tester.space_ref.clone());
             assert_eq!(
                 transaction,
                 if expect_consume {
@@ -809,11 +811,15 @@ mod tests {
             .unwrap();
         assert_eq!(
             transaction,
-            SpaceTransaction::set_cube(
-                [0, 0, 0],
-                Some(AIR),
-                Some(tool_block.clone().rotate(GridRotation::CLOCKWISE))
-            )
+            {
+                let mut t = SpaceTransaction::set_cube(
+                    [0, 0, 0],
+                    Some(AIR),
+                    Some(tool_block.clone().rotate(GridRotation::CLOCKWISE)),
+                );
+                t.add_fluff(Cube::ORIGIN, Fluff::PlaceBlockGeneric);
+                t
+            }
             .bind(tester.space_ref.clone())
         );
     }
diff --git a/all-is-cubes/src/space/space_txn.rs b/all-is-cubes/src/space/space_txn.rs
index 5face8f80..4a6785b75 100644
--- a/all-is-cubes/src/space/space_txn.rs
+++ b/all-is-cubes/src/space/space_txn.rs
@@ -397,12 +397,13 @@ impl Merge for SpaceTransaction {
 
 impl fmt::Debug for SpaceTransaction {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let Self { cubes, behaviors } = self;
         let mut ds = fmt.debug_struct("SpaceTransaction");
-        for (cube, txn) in &self.cubes {
+        for (cube, txn) in cubes {
             ds.field(&Cube::from(*cube).refmt(&ConciseDebug).to_string(), txn);
         }
-        if !self.behaviors.is_empty() {
-            ds.field("behaviors", &self.behaviors);
+        if !behaviors.is_empty() {
+            ds.field("behaviors", &behaviors);
         }
         ds.finish()
     }
@@ -444,7 +445,7 @@ impl fmt::Display for SpaceTransactionConflict {
 
 /// Data for a single cube in a [`SpaceTransaction`]. This does not function as a
 /// transaction on its own, though it does implement [`Merge`].
-#[derive(Clone, Debug, Default, Eq, PartialEq)]
+#[derive(Clone, Default, Eq, PartialEq)]
 struct CubeTransaction {
     /// Previous block which must occupy this cube.
     /// If `None`, no precondition.
@@ -471,6 +472,31 @@ struct CubeTransaction {
     fluff: Vec<Fluff>,
 }
 
+impl fmt::Debug for CubeTransaction {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let Self {
+            old,
+            new,
+            conserved,
+            activate,
+            fluff,
+        } = self;
+        let mut ds = f.debug_struct("CubeTransaction");
+        if old.is_some() || new.is_some() {
+            ds.field("old", &old);
+            ds.field("new", &new);
+            ds.field("conserved", &conserved);
+        }
+        if *activate {
+            ds.field("activate", &activate);
+        }
+        if !fluff.is_empty() {
+            ds.field("fluff", &fluff);
+        }
+        ds.finish()
+    }
+}
+
 impl CubeTransaction {
     const ACTIVATE: Self = Self {
         old: None,
diff --git a/all-is-cubes/src/universe/universe_txn.rs b/all-is-cubes/src/universe/universe_txn.rs
index f4914199c..7fb3956fa 100644
--- a/all-is-cubes/src/universe/universe_txn.rs
+++ b/all-is-cubes/src/universe/universe_txn.rs
@@ -743,7 +743,6 @@ mod tests {
                             },
                         ),
                         conserved: true,
-                        activate: false,
                     },
                 },
             }