GCS 503 when collectstatic

[adsee42]

I'm having this error when executing collectstatic with cloud build:

Deleting 'flags/sh.gif'
Copying '/usr/local/lib/python3.8/site-packages/django_countries/static/flags/sh.gif'
Deleting 'flags/mv.gif'
Copying '/usr/local/lib/python3.8/site-packages/django_countries/static/flags/mv.gif'
Deleting 'flags/lu.gif'
Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.8/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 187, in handle
    collected = self.collect()
  File "/usr/local/lib/python3.8/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 114, in collect
    handler(path, prefixed_path, storage)
  File "/usr/local/lib/python3.8/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 338, in copy_file
    if not self.delete_file(path, prefixed_path, source_storage):
  File "/usr/local/lib/python3.8/site-packages/django/contrib/staticfiles/management/commands/collectstatic.py", line 291, in delete_file
    self.storage.delete(prefixed_path)
  File "/usr/local/lib/python3.8/site-packages/storages/backends/gcloud.py", line 165, in delete
    self.bucket.delete_blob(name)
  File "/usr/local/lib/python3.8/site-packages/google/cloud/storage/bucket.py", line 1605, in delete_blob
    client._delete_resource(
  File "/usr/local/lib/python3.8/site-packages/google/cloud/storage/client.py", line 673, in _delete_resource
    return self._connection.api_request(
  File "/usr/local/lib/python3.8/site-packages/google/cloud/storage/_http.py", line 78, in api_request
    return call()
  File "/usr/local/lib/python3.8/site-packages/google/cloud/_http.py", line 484, in api_request
    raise exceptions.from_http_response(response)
google.api_core.exceptions.ServiceUnavailable: 503 DELETE https://storage.googleapis.com/storage/v1/b/statics/o/flags%2Flu.gif?prettyPrint=false: We encountered an internal error. Please try again.

I found #702 , and #698 seems to fixed that.
But I'm not sure my problem has anything to do with ACLs.

Django: 3.2
django-storage: 1.11