title: Error "MultiXactId **** has not been created yet -- apparent wraparound" on PG11
body: <p>I face an annoying problem on a Postgres 11.13 database when trying to get data from a big table.
  The first 6 millions rows can be fetched, then I get a &quot;<em><strong>MultiXactId **** has not been created yet -- apparent wraparound</strong></em>&quot; message.</p>
  <p>I've already tested, on this table :</p>
  <ul>
  <li>various &quot;select ...&quot; queries (even in functions with exception management to ignore possible errors)</li>
  <li>pg_dump</li>
  <li>REINDEX TABLE</li>
  <li>VACUUM FULL, with and without the zero_damaged_pages enabled</li>
  <li>VACUUM FREEZE, with and without the zero_damaged_pages enabled</li>
  </ul>
  <p>Nothing to do: I get every time that &quot;<em><strong>MultiXactId **** has not been created yet -- apparent wraparound</strong></em>&quot; error.</p>
  <p>Is there a solution to fix that kind of problem, or is that &quot;broken/corrupted&quot; table definitively lost ?</p>
  <p>Thanks in advance for any advice</p>