Use --prefer-offline

package.json

@@ -59,7 +59,7 @@
 		"webdriverio": "8.16.20"
 	},
 	"scripts": {
-		"postinstall": "npm ci --prefix gutenberg && ./bin/run-block-experiments-command.sh && npm run i18n:check-cache && ./bin/run-jetpack-command.sh \"install --offline --ignore-scripts\"",
+		"postinstall": "npm ci --prefix gutenberg && ./bin/run-block-experiments-command.sh && npm run i18n:check-cache && ./bin/run-jetpack-command.sh \"install --prefer-offline --ignore-scripts\"",
 		"start": "echo \"\\x1b[33mThe start command is not available in this project. It is strongly recommended to use \\x1b[1:33mstart:reset\\x1b[0m\\x1b[33m to perform some cleanup when starting the metro bundler.\nOr you may use \\x1b[1:33mstart:quick\\x1b[0m\\x1b[33m for a quicker startup, but this may lead to unexpected javascript errors when running the app.\\x1b[0m\"",
 		"start:reset": "npm run core clean:runtime && npm run start:quick -- --reset-cache",
 		"start:quick": "npm run core start:quick -- -- -- --config ../../../metro.config.js",