Why Maps shuts down on screenlock?

I use Honor 7x which has got Oreo update recently. While my phone was running in Nougat, I used the Android Maps navigation while I rid motorcycle with having my device in my trouser pocket with earphones plugged in and the screen locked. I was getting route instructions continuously like even for an hour with the screen locked. But after the Oreo update, the Maps-app reads instructions for few mins and goes silent because the app is getting closed after a while while the screen is locked. Is there a way I can have the Maps app keep running and instructing me until I close the App myself?

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