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Cook option `splitGeosByAttribute` hide point cloud output

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jasonwang0421
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Joined: March 2023
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I'm working with Houdini 20.5.370 and Unity. My porject is using `splitGeosByAttribute` cook option for split parts in geo.
My cook option is set by HAPI as following:
HEU_HAPIFunctions.HAPI_SetCustomString(ref session.GetSessionData()._HAPISession, "xxxx".AsByteArray(), out int value);
            HAPI_CookOptions cookOptions = new HAPI_CookOptions
            {
                splitGeosByGroup = false,
                splitGroupSH = 0,
                splitGeosByAttribute = true,
                splitAttrSH = value,
                clearErrorsAndWarnings = false,
                cookTemplatedGeos = false,
                splitPointsByVertexAttributes = false,
                packedPrimInstancingMode = HAPI_PackedPrimInstancingMode.HAPI_PACKEDPRIM_INSTANCING_MODE_DISABLED,
                handleBoxPartTypes = true,
                handleSpherePartTypes = true,
                checkPartChanges = false,
                cacheMeshTopology = false,
                preferOutputNodes = false
            };
When I want to follow the document PointInstancing [www.sidefx.com] to make Prefab instancing, I found the partCount for output HAPI_GeoInfo is 0 for points-only geometry. Then I tried to set `splitGeosByGroup` to true and disable `splitGeosByAttribute`, the partCount is 1, and I did get the points-only HAPI_PartInfo by HAPI as expected.
My sop network is quiet simple: grid -> scatter2 -> output, and no group or `splitAttrSH`(here is "xxxx") attribute is set, only "unity_instance" attribute is set for each point.

I want to know what makes this difference here, is this an expected feature? And what can I do to get the points-only part when `splitGeosByAttribute` is enabled ?
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