Anim Notifies and Curves are removed when saving Linked Animation Sequences through Sequencer

Found from AnswerHub: https://answers.unrealengine.com/questions/1005466/view.html

• Drag Mannequin_ControlRig into an empty level to create a sequence
• Animate some controls, then create a linked animation sequence (select actor in sequencer, right click, create linked animation sequence)
• Save it out to a location, then open the newly created animation asset
• Add some curves and some anim notifies, save the animation asset and close the asset
• In sequencer, add some keys on to controls and save the sequencer out
• Reopen the animation asset

Expected: animation asset should have updated animation from sequencer, however previously added anim notifies and anim curves should still exist

Actual: Animation asset has updated animation from sequencer, but previous anim notifies and anim curves are removed.

Animation curves and notifies are removed on saving linked animation sequence from level sequence