إِلَّا أَنْ يَأْتِيَ مَوْضِعٌ لَا يُسْتَغْنَى فِيهِ عَنْ تَرْدَادِ حَدِيثٍ فِيهِ زِيَادَةُ مَعْنًى،
An exception arises where a report contains an additional meaning and its repetition cannot reasonably be dispensed with.
Avoiding repetition is the general rule, but an addition supplying a material new meaning justifies an exception. It might clarify a condition, exception, qualification, or essential context. Not every verbal variant supplies such an addition.
The criterion is substantive benefit, not the number of extra words. Repeating a report is warranted when its second occurrence serves a distinct scholarly purpose.