Android Studio 4.1 does not automatically start the APP (cannot start the application) solution

The Android Studio version has been updated recently, from 3.6 to 4.1 directly.

But I found a problem, that is, after compiling and running the project, sometimes the project app is deployed to the mobile phone, but the app will not start automatically.

Searched the web a little bit and found a solution. It is to turn off the default hot update mode. Proceed as follows:

Settings->Build,Execution,Deployment->Debugger->HotSwap 

Then uncheck the Enable hot-swap agent for Groovy code option.

As shown below:

(Original link: https://blog.csdn.net/yuhaoboy1166/article/details/107044117/ )

I read that the comments say that 4.0.1 still can't solve it, so I don't know what's going on. Anyway, after my 4.1 is set up like this, there is no such problem, and it can be deployed and started at any time as before.