shunping opened a new pull request, #39118:
URL: https://github.com/apache/beam/pull/39118

   `beam.Create` reshuffles elements by default, causing runners to split them 
into multiple independent bundles. Since `BatchElements` must flush at bundle 
boundaries, this splits elements into batches smaller than `min_batch_size` and 
breaks strict batch size assertions in tests.
   
   To fix it, we made the following changes:
   - Set `reshuffle=False` in `beam.Create` for affected tests to keep elements 
in a single bundle.
   - Add `test_global_batching_dofn_single_vs_multiple_bundles` to 
`util_test.py` to verify this behavior.
   


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