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Bug in HaplotypeCaller:GT is called “./.”,but AD and DP isn't 0

HI, I'd like to report a weird result from HaplotypeCaller.
We have a patient sequenced by targeted sequencing,We expected to see no heterozygous variants called in this locus,it have found the insert ,but GT is "./.", and miss the other information;
Therefore I'm really confused why the substitution has "./." called by the HaplotypeCaller and why it passed the filter.

Many Thanks



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