Landscape material instance color parameter not working immediately

[whysay]

MaterialInstance.cpp

const bool bForceStaticPermutationUpdate = PropertyChangedEvent.ChangeType == EPropertyChangeType::Redirected;

to

const bool bForceStaticPermutationUpdate = PropertyChangedEvent.ChangeType == EPropertyChangeType::Redirected || PropertyChangedEvent.ChangeType == EPropertyChangeType::Interactive;

then works fine.