Speakerphone function doesn't work for second SIM

I have /e/ running on a Samsung S7 edge duos (dual SIM phone).

While making a call via the second SIM card, when I try to enable the speakerphone, I loose all call audio. This function works perfectly well for the first SIM.

I have tried swapping SIMs and it’s always the SIM located in the second position that has the problem.

OS build date is UTC 2019

Has anybody else encountered this issue or knows what’s causing it?