diff --git a/core/src/mindustry/ai/types/GroundAI.java b/core/src/mindustry/ai/types/GroundAI.java
index ac2c110c12..1775b7b7e2 100644
--- a/core/src/mindustry/ai/types/GroundAI.java
+++ b/core/src/mindustry/ai/types/GroundAI.java
@@ -1,5 +1,6 @@
 package mindustry.ai.types;
 
+import arc.math.*;
 import mindustry.ai.Pathfinder.*;
 import mindustry.entities.*;
 import mindustry.entities.units.*;
@@ -28,6 +29,10 @@ public class GroundAI extends AIController{
             }
         }
 
+        if(unit.type().canBoost){
+            unit.elevation = Mathf.approachDelta(unit.elevation, 0f, 0.08f);
+        }
+
         if(!Units.invalidateTarget(target, unit, unit.range())){
             if(unit.type().hasWeapons()){
                 unit.aimLook(Predict.intercept(unit, target, unit.type().weapons.first().bullet.speed));
diff --git a/core/src/mindustry/core/NetClient.java b/core/src/mindustry/core/NetClient.java
index db938323da..cdb42c9864 100644
--- a/core/src/mindustry/core/NetClient.java
+++ b/core/src/mindustry/core/NetClient.java
@@ -559,6 +559,22 @@ public class NetClient implements ApplicationListener{
                 //limit to 10 to prevent buffer overflows
                 int usedRequests = Math.min(player.builder().plans().size, 10);
 
+                int totalLength = 0;
+
+                //prevent buffer overflow by checking config length
+                for(int i = 0; i < usedRequests; i++){
+                    BuildPlan plan = player.builder().plans().get(i);
+                    if(plan.config instanceof byte[]){
+                        int length = ((byte[])plan.config).length;
+                        totalLength += length;
+                    }
+
+                    if(totalLength > 2048){
+                        usedRequests = i + 1;
+                        break;
+                    }
+                }
+
                 requests = new BuildPlan[usedRequests];
                 for(int i = 0; i < usedRequests; i++){
                     requests[i] = player.builder().plans().get(i);
diff --git a/core/src/mindustry/core/NetServer.java b/core/src/mindustry/core/NetServer.java
index d204e264d3..9e83f8dc03 100644
--- a/core/src/mindustry/core/NetServer.java
+++ b/core/src/mindustry/core/NetServer.java
@@ -614,7 +614,7 @@ public class NetServer implements ApplicationListener{
             Unit unit = player.unit();
 
             long elapsed = Time.timeSinceMillis(con.lastReceivedClientTime);
-            float maxSpeed = (boosting ? player.unit().type().boostMultiplier : 1f) * player.unit().type().speed;
+            float maxSpeed = ((player.unit().type().canBoost && player.unit().isFlying()) ? player.unit().type().boostMultiplier : 1f) * player.unit().type().speed;
             if(unit.isGrounded()){
                 maxSpeed *= unit.floorSpeedMultiplier();
             }
diff --git a/core/src/mindustry/net/Administration.java b/core/src/mindustry/net/Administration.java
index 0f289328d0..11ed794a4a 100644
--- a/core/src/mindustry/net/Administration.java
+++ b/core/src/mindustry/net/Administration.java
@@ -75,9 +75,13 @@ public class Administration{
         addActionFilter(action -> {
             if(action.type != ActionType.breakBlock &&
                 action.type != ActionType.placeBlock &&
-                Config.antiSpam.bool() &&
-                //make sure players can configure their own stuff, e.g. in schematics
-                lastPlaced.get(action.tile.pos(), -1) != action.player.id()){
+                Config.antiSpam.bool()){
+
+                //make sure players can configure their own stuff, e.g. in schematics - but only once.
+                if(lastPlaced.get(action.tile.pos(), -1) == action.player.id()){
+                    lastPlaced.remove(action.tile.pos());
+                    return true;
+                }
 
                 Ratekeeper rate = action.player.getInfo().rate;
                 if(rate.allow(Config.interactRateWindow.num() * 1000, Config.interactRateLimit.num())){
diff --git a/core/src/mindustry/ui/dialogs/ResearchDialog.java b/core/src/mindustry/ui/dialogs/ResearchDialog.java
index fd7bbf0c86..8fc2c387c7 100644
--- a/core/src/mindustry/ui/dialogs/ResearchDialog.java
+++ b/core/src/mindustry/ui/dialogs/ResearchDialog.java
@@ -233,7 +233,7 @@ public class ResearchDialog extends BaseDialog{
     }
 
     boolean selectable(TechNode node){
-        return !node.objectives.contains(i -> !i.complete());
+        return node.content.unlocked() || !node.objectives.contains(i -> !i.complete());
     }
 
     void showToast(String info){
diff --git a/gradle.properties b/gradle.properties
index 213f452ee6..f4f9071b07 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
 org.gradle.daemon=true
 org.gradle.jvmargs=-Xms256m -Xmx1024m
-archash=1040fdcbb5760e4c4a646d64782a25761efc1159
+archash=b06edb6b57c0e6247c1856c507a33fb8b64656e7