Split screen


I am trying to use blynk in split screen with tinycam pro.
Android 9, Huawei p30 pro
I launch tinycam first, split screen and launch blynk.
Sometimes it works and sometimes blynk will just launch in full screen mode.
If I do the opposite, blynk first then tinycam it works.
Is this a known behaviour or something specific to my phone?

Thank you