The custom email notification sound gets interrupted by the default notifications sound?

[Android Central Question]

Hello everyone! I'm on Huawei P8 Lite 2017 version 7.1 and the custom email notification sound gets interrupted by the default notification sound, in details:

i'm using the default Google Mail app and today i changed the notification sound of the email from the app but when my custom sound start, suddently gets interrutpted by the default notification sound.

There is a way to solve this problem?

The sound that interrupt the custom email sound is the one in Options > Audio > Default Notificaions sound.

Of course i can't change that one because will change every notification sound not only the email one.

I already tried to lock the notification for the email but in that case i dont get notifications, so both of the sound dont play.

Thanks in advance!