About 35976d7cb070b06a2dec1482aaca2982df3fedd4 which I think you obtained from the wbgetclaims api[0]? I think this hash identifies the Snak while the one you see from the query service identifies the Value, the former will uniquely identifies the Snak so that for another entity using the same value[1] the Snak hash is different (8eb6208639efa82b5e7e4c709b7d18cbfca67411) but the value is identical (+2019-12-14T00:00:00Z).