There's apparently a way to disable the logs, see the bottom of this page:

https://stackoverflow.com/questions/58321114/why-i-get-the-console-warning-process-kill-returned-unexpected-error-1-when

Unfortunately, this apparently will never get fixed as it is still present in iOS 13.2.2. It's also creating massive CPU and battery drain, though I'm not sure if it's only while running in XCode, or also in the App Store version.

A massive problem for sure.

Will never get fixed? How did you come up with that @SevenSystems?

Indeed a massive problem and I am wondering why it is not getting much attention and a rapid fix! Many has reported that this problem is present in both XCode and downloaded apps. Also, some reported that this problem is crashing their apps no matter what. Honestly, I started now questioning the reliability of developing native apps on top of ionic/cordova/capacitor.

same

This isn't an Ionic bug, but rather a WebKit one. Unfortunately, not much to do until Apple deploys a fix in a future version of iOS.

Same problem, who can give a solution?

Same problem. Just fills up my logs.

无情，还搞个鸡毛？

it's fixed on iOS 13.4