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I don't know if this helps, but before you save your song, try setting the song name by clicking on the Song Name window (image 1, below), then selecting Save from the File drop-down menu, and making sure it is saved with the file name you have chosen.

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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.