[RHUI 3] RHEL 8 Appstream リポジトリーの同期が 'Error: strings in documents must be valid UTF-8' または 'Importer indicated a failed response' と表示されて失敗する

Issue

• RHEL 8 Appstream リポジトリーの同期に失敗しました。タスクの詳細は次のとおりです。

:
(snip)
Metadata:
      State: FINISHED
    Modules:
      Error: strings in documents must be valid UTF-8:
             'x82x00x00x00x041.16x00x13x00x00x00x020x00x07x00x00
             x00commonx00x00x041.22x00x13x00x00x00x020x00x07x00x00
             x00commonx00x00x041.14x00x13x00x00x00x020x00x07x00x00
             x00commonx00x00x041.20x00x13x00x00x00x020x00x07x00x00
             x00commonx00x00x041.18x00x13x00x00x00x020x00x07x00x00
             x00commonx00x00x00'
      State: FAILED
    Purge Duplicates:
      State: NOT_STARTED
Traceback:        Traceback (most recent call last):   File
                  "/usr/lib/python2.7/site-packages/celery/app/trace.py", line
                  367, in trace_task     R=retval=fun(*args, **kwargs)
                  File
                  "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py",
                  line 529, in __call__     return super(Task,
                  self).__call__(*args, **kwargs)   File
                  "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py",
                  line 107, in __call__     return super(PulpTask,
                  self).__call__(*args, **kwargs)   File
                  "/usr/lib/python2.7/site-packages/celery/app/trace.py", line
                  622, in __protected_call__     return self.run(*args,
                  **kwargs)   File
                  "/usr/lib/python2.7/site-packages/pulp/server/controllers/repo
                  sitory.py", line 828, in sync     raise
                  pulp_exceptions.PulpExecutionException(_('Importer indicated a
                  failed response')) PulpExecutionException: Importer indicated
                  a failed response