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MS team will run the code via dev console to close the problematic Batch Record using the specific ID of the Batch record;
MS is doing proof of concept for a custom Close Batch button that will enforce the system to just use Batch size 1 instead of the default 10. However this will require effort in simulating and replicating the behavior of the AQ Close Batch button as the design is not visible to developers. Another drawback is, there might be processes that will not be covered by the custom button
Affinaquest to provide configuration settings that can control the Batch Size (This can be considered as enhancement, as per AQ support)