Address grouping issue

def collect_premises_validation_errors(propertydata: dict | None) → list[dict]: """Collect premises rows that repeat the same address for the same subject. Premises rows are linked to locations by street address, so one address legitimately carries many rows - one per subject of insurance. A duplicate is therefore the \*same address with the same subject\*; rows without an address fall back to the legacy \`\`premises_number\`\` / \`\`building_number\`\` identity. Every row sharing a dupl...