Why there's a Zip inside APK increasing the package size?

I’m using Ionic build in cloud (now called Pro) and I noticed it was considerably heavier than the same I can produce using terminal ionic cordova build android command. I downloaded Ionic’s version and compared with terminal’s one and found out that there’s .zip inside of cloud version that’s the cause of this size increment:

As you can see, there’s a mysterious zip file “9462d352-e743-4a39-9c54-2624458d8e68.zip” that contains a copy of:
assets, build, index.html, manifest.json and service-worker.js.

Is this necessary for some reason? I mean, it’s not a difference of some KB, the package is increasing it’s size from 10.9 MB to 19 MB, almost 100% :scream: