I have a question about "Layered" in the animation options.

When this option is selected, the keys will be preserved even if the cleanup is performed.
But some keys were not preserved and cleaned up.
Dope Sheet

json File when Export with No Clean Up

json File when Export with Layered Option Selected and Clean Up

Are these keys not preserved even if the Layered option is selected?
Ver. Spine 4.1.24
Thank you.