--- ./engine/src/flutter/tools/pub_get_offline.py.orig
+++ ./engine/src/flutter/tools/pub_get_offline.py
@@ -148,10 +148,6 @@
       SRC_ROOT, 'flutter', 'third_party', 'dart', 'tools', 'sdks', 'dart-sdk', 'bin'
   )
 
-  # Delete all package_config.json files. These may be stale.
-  # Required ones will be regenerated fresh below.
-  delete_config_files()
-
   # Ensure all relevant packages are listed in ALL_PACKAGES.
   unlisted = find_unlisted_packages()
   if len(unlisted) > 0: