TMap does not rehash when the property change if the key is struct

If TMap's Key is a unique Struct, TMap's rehash will not run even if elements are added or changed in DetailPanel such as DataAsset. So TMaps's Find etc. will fail

This issue is very similar to [Link Removed]. However, in this case FPropertyValueImpl::ImportText cannot get the FMapProperty, so the fix code in [Link Removed] will not work.

It is possible to avoid the problem by calling rehash on the project side as below.

void UMapTestDataAsset::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
    Super::PostEditChangeProperty(PropertyChangedEvent);
 
    FMapProperty* const MapProperty = CastField<FMapProperty>(PropertyChangedEvent.MemberProperty);
    FScriptMapHelper ScriptMapHelper (MapProperty, &Records);
    ScriptMapHelper.Rehash();
} 

1. Open attached project
2. Open MapTestDataAsset
3. Add 4 Items
4. Press RunFind of MapTestDataAsset

expect : RunFind finish properly
result : ensure occur of  UMapTestDataAsset::RunFind()

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