I think it definitely could've underreported. This stretch seems like it should've dropped more than 0.01".
METAR KDDH 202135Z AUTO 30010G16KT 1/2SM SN VV011 M13/M16 A2949 RMK AO2 P0001 T11281156 =
METAR KDDH 202124Z AUTO 29009KT 1SM -SN VV012 M12/M16 A2949 RMK AO2 P0001 T11221156 =
METAR KDDH 202111Z AUTO 29007KT 1/2SM SN VV008 M12/M15 A2947 RMK AO2 P0001 T11221150 =
METAR KDDH 202054Z AUTO 29008KT 1/2SM SN VV011 M12/M15 A2947 RMK AO2 SLP991 P0000 60000 T11171150 53024 =
METAR KDDH 202046Z AUTO 31007KT 3/4SM -SN BKN013 OVC027 M12/M15 A2947 RMK AO2 PRESRR P0000 T11171150 =
I'm not sure what the gauge is there...ie AWPAGs or a heated tipper.