Strange, just tested it on a Max2018, result attached. I moved one of the two camera -5 in x direction to be able to view both. One is created by script, the other by the button of the Corona toolbar. I have no Max 2020 available to test it there. Are you sure, you modified the script correctly? Or is this the result of creating a camera by script and then clicking "Targeted"?
Btw: I can confirm the issue with the tooltip when moving a button from Corona toolbar to another one, even for Max 2016. But changes inside the Corona toolbar are persistent here.
Good Luck