Why Do not disturb doesn't work anymore on Huawei P10 after updating to Pie?

[Android Central Question]

Since my Huawei P10 received softwareupdate to Pie and EMUI 9.0.1, Do not disturb function doesn't do the job anymore. It runs at specific hours but doesn't mute the phone ringer as it did till the update. It worked great but now is not. The phone isn't rooted so third party apps not working. Any solution to this? Thanks.