update global custom blocks in data

HISTORY.md

@@ -51,6 +51,7 @@
 ### 2022-05-19
 * blocks, lists, objects, threads: made global Contexts observable 
 * gui: pushed dev version to 8
+* byob: update global custom blocks in data
 
 ### 2022-05-17
 * blocks: added experimental private isChangeableTo(type) method

src/byob.js

@@ -111,7 +111,7 @@ ArgLabelMorph*/
 
 // Global stuff ////////////////////////////////////////////////////////
 
-modules.byob = '2022-May-03';
+modules.byob = '2022-May-19';
 
 // Declarations
 
@@ -2669,6 +2669,9 @@ BlockEditorMorph.prototype.refreshAllBlockInstances = function (oldSpec) {
         this.target.allBlockInstances(this.definition).reverse().forEach(
             block => block.refresh()
         );
+        this.target.parentThatIsA(StageMorph).allContextsUsing(def).forEach(
+            context => context.changed()
+        );
     } else {
         this.target.allDependentInvocationsOf(oldSpec).reverse().forEach(
             block => block.refresh(def)