If remove the muted side from the two child tracks in sequencer, the remaining tracks will be muted forever

"Engine\Source\Runtime\MovieScene\Public\MovieSceneTrack.h"
// add
MOVIESCENE_API void ClearRowEvalDisabled(); 

"Engine\Source\Runtime\MovieScene\Private\MovieSceneTrack.cpp"
// add
MOVIESCENE_API void UMovieSceneTrack::ClearRowEvalDisabled()
{ 
   RowsDisabled.Empty();
} 

"Engine\Source\Editor\Sequencer\Private\DisplayNodes\SequencerTrackNode.cpp"
void FSequencerTrackNode::UpdateInnerHierarchy()
{
...  
const int32 MaxRowIndex = Track->GetMaxRowIndex(); 
if (MaxRowIndex == 0) 
{ 
   // Single row, perhaps with a top level key area 
   if (SubTrackMode != ESubTrackMode::None) 
   { 
      RequestReinitialize(); SubTrackMode = ESubTrackMode::None;
      
      // add 
      Track->ClearRowEvalDisabled();  
      
      ClearChildren(); 
   }  
UpdateSections(); 
}

...
}