diff --git a/pxtblocks/help.ts b/pxtblocks/help.ts
index fed942979d55..21dd47582161 100644
--- a/pxtblocks/help.ts
+++ b/pxtblocks/help.ts
@@ -5,7 +5,7 @@ import * as Blockly from "blockly";
 import { cleanOuterHTML, getFirstChildWithAttr } from "./xml";
 import { promptTranslateBlock } from "./external";
 import { createToolboxBlock } from "./toolbox";
-import { DuplicateOnDragStrategy } from "./plugins/duplicateOnDrag";
+import { DuplicateOnDragStrategy, setDuplicateOnDragStrategy } from "./plugins/duplicateOnDrag";
 
 export function setBuiltinHelpInfo(block: any, id: string) {
     const info = pxt.blocks.getBlockDefinition(id);
@@ -23,7 +23,7 @@ export function setHelpResources(block: Blockly.BlockSvg, id: string, name: stri
     if (colour) block.setColour(colour);
     if (undeletable) block.setDeletable(false);
 
-    block.setDragStrategy(new DuplicateOnDragStrategy(block));
+    setDuplicateOnDragStrategy(block);
 
     let tb = document.getElementById('blocklyToolboxDefinition');
     let xml: HTMLElement = tb ? getFirstChildWithAttr(tb, "block", "type", id) as HTMLElement : undefined;
diff --git a/pxtblocks/loader.ts b/pxtblocks/loader.ts
index 71aaa3543bd0..1f9da7053821 100644
--- a/pxtblocks/loader.ts
+++ b/pxtblocks/loader.ts
@@ -25,7 +25,7 @@ import { initContextMenu } from "./contextMenu";
 import { renderCodeCard } from "./codecardRenderer";
 import { applyMonkeyPatches } from "./monkeyPatches";
 import { FieldDropdown } from "./fields/field_dropdown";
-import { DuplicateOnDragStrategy, setDraggableShadowBlocks } from "./plugins/duplicateOnDrag";
+import { setDraggableShadowBlocks, setDuplicateOnDragStrategy } from "./plugins/duplicateOnDrag";
 
 
 interface BlockDefinition {
@@ -217,9 +217,7 @@ function initBlock(block: Blockly.Block, info: pxtc.BlocksInfo, fn: pxtc.SymbolI
     const helpUrl = pxt.blocks.getHelpUrl(fn);
     if (helpUrl) block.setHelpUrl(helpUrl)
 
-    if ((block as Blockly.BlockSvg).setDragStrategy) {
-        (block as Blockly.BlockSvg).setDragStrategy(new DuplicateOnDragStrategy(block as Blockly.BlockSvg));
-    }
+    setDuplicateOnDragStrategy(block);
 
     block.setColour(typeof color === "string" ? pxt.toolbox.getAccessibleBackground(color) : color);
     let blockShape = provider.SHAPES.ROUND;
diff --git a/pxtblocks/plugins/duplicateOnDrag/dragStrategy.ts b/pxtblocks/plugins/duplicateOnDrag/dragStrategy.ts
index 58910104b7fb..49702d336376 100644
--- a/pxtblocks/plugins/duplicateOnDrag/dragStrategy.ts
+++ b/pxtblocks/plugins/duplicateOnDrag/dragStrategy.ts
@@ -468,3 +468,8 @@ export class DuplicateOnDragStrategy implements Blockly.IDragStrategy {
         this.dragging = false;
     }
 }
+
+
+export function setDuplicateOnDragStrategy(block: Blockly.Block | Blockly.BlockSvg) {
+    (block as Blockly.BlockSvg).setDragStrategy?.(new DuplicateOnDragStrategy(block as Blockly.BlockSvg));
+}
\ No newline at end of file
diff --git a/pxtblocks/plugins/functions/blocks/argumentReporterBlocks.ts b/pxtblocks/plugins/functions/blocks/argumentReporterBlocks.ts
index fa6ff4b54633..37c2d3b2a286 100644
--- a/pxtblocks/plugins/functions/blocks/argumentReporterBlocks.ts
+++ b/pxtblocks/plugins/functions/blocks/argumentReporterBlocks.ts
@@ -7,7 +7,7 @@ import {
     ARGUMENT_REPORTER_CUSTOM_BLOCK_TYPE,
 } from "../constants";
 import { MsgKey } from "../msg";
-import { DUPLICATE_ON_DRAG_MUTATION_KEY, DuplicateOnDragStrategy } from "../../duplicateOnDrag";
+import { DUPLICATE_ON_DRAG_MUTATION_KEY, DuplicateOnDragStrategy, setDuplicateOnDragStrategy } from "../../duplicateOnDrag";
 import { PathObject } from "../../renderer/pathObject";
 
 type ArgumentReporterMixinType = typeof ARGUMENT_REPORTER_MIXIN;
@@ -57,7 +57,7 @@ Blockly.Blocks[ARGUMENT_REPORTER_BOOLEAN_BLOCK_TYPE] = {
             extensions: ["output_boolean"],
         });
         this.typeName_ = "boolean";
-        this.setDragStrategy(new DuplicateOnDragStrategy(this));
+        setDuplicateOnDragStrategy(this);
     },
 };
 
@@ -77,7 +77,7 @@ Blockly.Blocks[ARGUMENT_REPORTER_STRING_BLOCK_TYPE] = {
             extensions: ["output_string"],
         });
         this.typeName_ = "string";
-        this.setDragStrategy(new DuplicateOnDragStrategy(this));
+        setDuplicateOnDragStrategy(this);
     },
 };
 
@@ -97,7 +97,7 @@ Blockly.Blocks[ARGUMENT_REPORTER_NUMBER_BLOCK_TYPE] = {
             extensions: ["output_number"],
         });
         this.typeName_ = "number";
-        this.setDragStrategy(new DuplicateOnDragStrategy(this));
+        setDuplicateOnDragStrategy(this);
     },
 };
 
@@ -117,7 +117,7 @@ Blockly.Blocks[ARGUMENT_REPORTER_ARRAY_BLOCK_TYPE] = {
             extensions: ["output_array"],
         });
         this.typeName_ = "Array";
-        this.setDragStrategy(new DuplicateOnDragStrategy(this));
+        setDuplicateOnDragStrategy(this);
     },
 };
 
@@ -139,7 +139,7 @@ Blockly.Blocks[ARGUMENT_REPORTER_CUSTOM_BLOCK_TYPE] = {
             output: null,
         });
         this.typeName_ = "";
-        this.setDragStrategy(new DuplicateOnDragStrategy(this));
+        setDuplicateOnDragStrategy(this);
     },
 
     mutationToDom(this: ArgumentReporterBlock) {