You have misunderstood it. Tim_A did not have any issue really, he just did not know how adaptive icons worked. Back then this (newly introduced) bug did not exist. It was introduced in v12 of android cordova, just recently.
If you use cordova locally on your computer you can use the nightly build, where this issue is fixed. but it is not released in a stable yet. or build with android studio on your own.
You can probably adjust the config.xml file before building to get it to work as well, see the link I posted. But then you need to export as cordova, adjust, then import for just building, if you use the build service.