M2M Prefetch Loses Sub-Prefetches

Describe the bug
During a M2M prefetch, any subsequent prefetches (particularly those in _prefetch_queries) are lost.

To Reproduce
I can provide a further set of models and example sometime, but I know the solution, so I'll just describe.

If you have a M2M relation and do a prefetch with it, then do a sub-prefetch, the M2M prefetch does not pass the subquery to the executor created.

Expected behavior
Prefetch should continue to prefetch until the DBA yells at me.

Additional context
Solution...
In base_executor.
In _prefetch_m2m_relation

Around line 395 insert prefetch_queries=related_query._prefetch_queries

       await self.__class__(
           model=related_query.model, db=self.db, prefetch_map=related_query._prefetch_map,
             prefetch_queries=related_query._prefetch_queries
         )._execute_prefetch_queries(related_object_list)

Without that line, a new executor is created without passing prefetch_queries, and the final prefetch query is lost.

Read base_executor.py at _prefetch_m2m_relation and trace how the newly created executor receives the related query state. Verify the M2M prefetch path preserves nested prefetch queries, and confirm that sub-prefetches continue executing instead of being dropped.