Screen dimming automatically?

Hello.. I think I have the same problem but my phone is Huawei Nova Young. So i guess is not a mobile brand issue but android issue? I have emui 4.1as version of software but Im not very experienced on technical issues... What can I do to fix this?
 
I just bought an Honor Play. Having the same issue. Sudden brightness change when opening certain apps. It's running EMUI 8.1 so it's not been fixed! Disappointing.
 
I FOUND A FIX for mine anyway. If you've turned off animation in developr mode just turn it back on. Fixed mine.
 

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