New API interface, part of SNP extraction is missing

[flash0926]

When I use the new API to extract SNP associate data, sometimes empty results are returned directly. Whether I extract 5,000 SNPs at once or separately, there will be similar problems.
For example, 5000 SNPs are divided into 1000 and extracted five times. Except for the first batch, which can be extracted successfully, the subsequent batches will quickly return results, but the results are empty.