Two things:

1:
I'm not sure if this is Mac only related issue. I just tried with Windows 2022 latest build and set an 8 bar song with a tempo of 120 to change the tempo by -50% at bar 5. During playback, the tempo changed to 60 as expected.


2: Rather than 'Off Topic', this post might be better placed in either the Beginners or the Mac section of the forums. Perhaps the Moderators might move it for you?

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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.