AspectRatioAxisConstraint forced to be AspectRatio_MaintainXFOV

A licensee wants to enforce YFov constraint for a game project by setting AspectRatioAxisConstraint=AspectRatio_MaintainYFOV in the config.

However during playing the sequence, the value of AspectRatioAxisConstraint is forced to be AspectRatio_MaintainXFOV in ULevelSequencePlayer::UpdateCameraCut function, and it keeps the AspectRatio_MaintainXFOV value for the game thereafter.

1 Adding the following to DefaultEngine.ini:

[/Script/Engine.LocalPlayer]
AspectRatioAxisConstraint=AspectRatio_MaintainYFOV

2 Create a map, add a level sequence and add a new camera track to the sequence

3 set the sequence to auto play and launch the game 

Results: Before playing the sequence, the AspectRatioAxisConstraint for local player is AspectRatio_MaintainYFOV as configured.
After playing the sequence, the AspectRatioAxisConstraint for local player is changed to AspectRatio_MaintainXFOV.

Expected Result: AspectRatioAxisConstraint for local player is always AspectRatio_MaintainYFOV as configured, during and after playing the sequence.