When this problem occurs, "MaterialExpression" is null in FMaterialInstanceParameterDetails::GetParameterExpressionDescription.

Steps to Reproduce

1.Create NewMaterial and open MaterialEditor.
2.Add MakeFloat3Node ( Add any MaterialFunctionNode ).
3.Add ScalarParameterNode and add comment at "Desc" in DetailTab.
4.Create MaterialInstance from this material, and open MaterialInstance.
5.When show scalar parameter's desc, I see "ParameterValue".
It is not update.

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ComponentUE - Rendering - Materials
Affects Versions4.16
Target Fix4.18
Fix Commit3602651
Main Commit3621569
Release Commit3643070
CreatedJul 19, 2017
ResolvedAug 22, 2017
UpdatedNov 2, 2021