Can't adjust speaker volume on Signal/Threema calls on OnePlus Nord (avicii)

When I switch on the speaker during a call on Signal and also on Threema, I can’t adjust the speaker volume!
I tried all available volume control sliders with no success. The volume remains as it is (a bit too loud for me).
It works fine for normal phone calls: The volume is adjustable!

Can anyone confirm this issue?
Does anyone have a solution to the problem?

The issue occurs on my OnePlus Nord (avicii). I first noticed it on /e/OS 4.2 (A16, official), and it’s still present on 4.3. I don’t know if it was there before, as I haven’t used the feature until now.

(Edit: Same issue on Threema)

Same problem here, i’ve opened an issue [OnePlus Nord Avicii] VoIP in-call volume doesn't work on official /e/OS 4.x A16 (#9747) · Issues · e / Backlog · GitLab

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