Changing "Played Duration" does not work

Dear developers and advanced users,

Could anyone explain why the “Played Duration” of the selected three notes could not be changed in the attached project file?

editing played (984 KB)
I cannot find what I falsely did.

I appreciate any help you can provide.

You cannot adjust the played duration of notes that are generating additional notes by way of tremolos.

Thank you for letting me know the reason! I hope that this behavior might be improved in future version. It would be really great!