I can see and definitely agree that it's not working for you.

I tried to create the same situation as you, with the same style, edit mode, clean mode, mono mode, etc.

How did you create the Melody?

It's working for me:
Anybody?

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BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.