Try logging the URL's we get at time of open

src/vs/code/node/paths.ts

@@ -15,6 +15,7 @@ export function validatePaths(args: ParsedArgs): ParsedArgs {
 
 	// Track URLs if they're going to be used
 	if (args['open-url']) {
+		console.log('paths#validate', JSON.stringify(args._), JSON.stringify(args._urls));
 		args._urls = args._;
 		args._ = [];
 	}

src/vs/platform/launch/electron-main/launchMainService.ts

@@ -36,6 +36,8 @@ function parseOpenUrl(args: ParsedArgs): URI[] {
 	if (args['open-url'] && args._urls && args._urls.length > 0) {
 		// --open-url must contain -- followed by the url(s)
 		// process.argv is used over args._ as args._ are resolved to file paths at this point
+		console.log('Launch main service # parseOpenURl' + JSON.stringify(args._urls));
+		(globalThis as any)['launchMainService#parseOpenUrl'] = args._urls;
 		return coalesce(args._urls
 			.map(url => {
 				try {