Volume buttons cannot be used when the screen is off

[Gempar]

So I've had Zenfone 9 for about a month or so. At first there was no problem, the volume buttons still work even though the screen is off, but recently I noticed that when I put music on while the screen is off, I can't adjust the sound anymore via the volume buttons. Only if the screen is on, the sound volume can be adjusted using the volume buttons. I've done a factory reset but still can't.

[ZenBot]

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