Crash when editing FRuntimeFloatCurve's curve from sequencer's edit key window

Crash when editing a FRuntimeFloatCurve curve exposed through EventTrack or a self-made Struct from the sequencer key edit window.

FRuntimeFloatCurve does not support Expose to Cinematic, so this may be a specification, but I wonder if it is necessary to avoid crashes.

In addition, [Link Removed] and this issue are close, and similar fixes may be effective

1. Open repro proj
2. Add breakpoint to SDetailsViewBase::NotifyFinishedChangingProperties
3. Open NewLevelSequence
4. Edit FRuntimeFloatCurve's Curve of Key of "Sample"

result : crash