Based on the given hint and the analysis of the provided dataset, I've identified the following issue:

```json
{
    "issue": "Unusual 'rating' value",
    "evidence": "'|' in row with product id B08L12N5H1",
    "description": "The 'rating' value for product ID B08L12N5H1 is represented by an unusual character '|', which deviates from expected numeric values used to represent product ratings."
}
```

This issue clearly indicates a data quality problem where the rating, ideally a numeric value reflecting customer satisfaction, is instead an irrelevant symbol. This could lead to misinterpretation in analyses relying on product ratings.