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Issue: Conflict between setSequenceCallback and RewindableException handling in BatchEventProcessor

Issue: Conflict between setSequenceCallback and RewindableException handling in BatchEventProcessor: a task in LegoFlow-SWE (Harbor dataset). When an EventHandler does not implement setSequenceCallback , the current rewind behaviour should remain unchanged.

The task

When an `EventHandler` **does not** implement `setSequenceCallback`, the current rewind behaviour should remain unchanged.

Part of Lego-X/LegoFlow-SWE.