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GATK4.0.9.0 undetected a delins site

Dear GATK team,
I use GATK4.0.9.0 Haplotypercaller to detect germline variation, and find a delins site is not call. As the figure show, this is gvcf output, 32944606 is delTTT, and 32944609 is insAAAA. But the vcf output only is delTTT, insAAAA is filtered. And I find the in GATK4.1.1.0 and 4.1.2.0 also not call insAAAA in vcf. The site is verified by Sanger, and is a delinsAAAA. So why GATK4.0.9.0 filtered the insAAAA in 32944609 ?

The vcf of GATK4.0.9.0:
chr13 32944606 . CTTT C 9318.60 . AC=1;AF=0.500;AN=2;BaseQRankSum=1.294;DP=814;ExcessHet=3.0103;FS=1.093;MLEAC=1;MLEAF=0.500;MQ=60.03;MQRankSum=0.000;QD=11.90;ReadPosRankSum=0.290;SOR=0.769 GT:AD:DP:GQ:PL 0/1:423,360:783:99:9326,0,45236
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