Auto Size in Sequencer not working on MovieSceneSkeletalAnimationSection

My understanding of the Auto Size feature on sections in Sequencer is that I should be able to auto size a section based on its contents. For example, if pressing auto size on an animation clip, it should expand or contract to the start/end of the animation without causing any looping or cutting short. This doesn't work, and isn't even accessible on MovieSceneSkeletalAnimationSections.

I've tried this on a Niagara Simulation Cache and it works as expected.

I'd expect this to work on MovieSceneSkeletalAnimationSections as well

Steps to Reproduce

1. Create a level sequence, add a skeletal mesh with an animation track/section added to it
2. Trim or expand the MovieSceneSkeletalAnimationSection
3. Right click the MovieSceneSkeletalAnimationSection, go Edit>Auto Size
4. You'll see auto size is grayed out

 

Similarly you can write a quick script to print "Get Auto Size Has End Frame" or "Get Auto Size Has Start Frame" based on the animation section, and you'll find they both return false.

 

The animation clip does have a start/end frame, and should be able to auto size to its contents properly.