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Bug Report: FIFO overwritable mode causes data corruption, double overflow, and incorrect count/indices

Bug Report: FIFO overwritable mode causes data corruption, double overflow, and incorrect count/indices: a task in LegoFlow-SWE (Harbor dataset). Symptom: When a ring buffer (FIFO) is configured with overwritable mode enabled, writing to a full buffer corrupts internal state. This leads to:

The task

**Symptom:** When a ring buffer (FIFO) is configured with overwritable mode enabled, writing to a full buffer corrupts internal state. This leads to:

Part of Lego-X/LegoFlow-SWE.