Lock Screen During Calls

In being on the road intensely for the play few weeks, I’ve ended up making and taking many more calls while on my phone. Sometimes, a call goes to voicemail and I’d prefer not to leave a message. And then it hits… Samsung in all its wisdom decides to throw up a lockscreen during the call (at least with the S8)
What makes the experience even better is that the unlock function fails. Fingerprint doesn’t work or facial recognition shows that it doesn’t function for some reason (camera app is running or something similar).
This seems like a relatively easy problem to solve… don’t lock the screen during voice calls, whether they be through the phone, WhatsApp, Skype or something else.
Live voice calls take a certain cognitive load. Better to reduce anything that could increase it.