Non-recombined sequence leading to IGK false positive.
See NAN - Nantes email on 2023-08-10 mentioning this issue:
He points this sequence:
ATGTGGACTCCCTCATGAGCAGATGCCACCAGGGCCACTGGCCCCAGCTTCCTCCTTCACAGCTGCAGTGGGGGCTGGGGCTGGGGCATCCCAGGGAGGGTTTTTGTATGAGCCTGTGTCACAGTGTGTGGTATTCGGCGGAGGGACCAAGCTGACCGTCCTAGGTGAGTCTCTTCTCCCCTCTCCTTCCCCGCTCTTGGGACAATTTCTGCTGTTTTTGTTTGTTTCTGTATCTTGTCTCA
where we find a IGKV2D-29 0/78/7 J4