Fix #125506

src/vs/workbench/contrib/welcome/gettingStarted/browser/gettingStartedExtensionPoint.ts

@@ -159,12 +159,12 @@ export const walkthroughsExtensionPoint = ExtensionsRegistry.registerExtensionPo
 											body: 'onContext:${2:key}'
 										},
 										{
-											label: 'extensionInstalled',
+											label: 'onExtensionInstalled',
 											description: localize('walkthroughs.steps.completionEvents.extensionInstalled', 'Check off step when an extension with the given id is installed. If the extension is already installed, the step will start off checked.'),
 											body: 'extensionInstalled:${3:extensionId}'
 										},
 										{
-											label: 'stepSelected',
+											label: 'onStepSelected',
 											description: localize('walkthroughs.steps.completionEvents.stepSelected', 'Check off step as soon as it is selected.'),
 											body: 'stepSelected'
 										},

src/vs/workbench/contrib/welcome/gettingStarted/browser/gettingStartedService.ts

@@ -609,14 +609,14 @@ export class GettingStartedService extends Disposable implements IGettingStarted
 					}
 					break;
 				}
-				case 'stepSelected':
-					event = eventType + ':' + step.id;
+				case 'onStepSelected': case 'stepSelected':
+					event = 'stepSelected:' + step.id;
 					break;
 				case 'onCommand':
 					event = eventType + ':' + argument.replace(/^toSide:/, '');
 					break;
-				case 'extensionInstalled':
-					event = eventType + ':' + argument.toLowerCase();
+				case 'onExtensionInstalled': case 'extensionInstalled':
+					event = 'extensionInstalled:' + argument.toLowerCase();
 					break;
 				default:
 					console.error(`Unknown completionEvent ${event} when registering step ${step.id}`);