Incorrect playback when slur starts at end of tie chain

When a slur starts at the beginning of a tie chain, playback is correct:

But when a slur starts at the end of a tie chain, playback is not correct:

These examples use NotePerformer because its expression map makes it easy to see where the natural and legato techniques are being applied. However, this problem also occurs when using HSSE and HSO.

FWIW, I agree that it ought to play correctly, but your second example looks really peculiar to me. I would not use that notation.