Via stitching generator plugin (on macOS version 8.0.7)

I like this and can work with it but I notice on the macOS port at least that if I have a full ground plane and create a keepout area within that, so it looks like a hole, I get vias in the hole. Often one can avoid having fill keep-out areas with more elaborate fill constructions and that is my workaround.

Is this intentional? Of course I’m clicking the box to get vias in the selected region.

I suppose you could ungroup the vias and then they could be deleted manually?

My windows machine is briefly out of commission so I haven’t checked that port.

You should ask this on the plugin’s github or through whatever channel the author of the plugin provided in the plugins description.
It’s not guaranteed that the author reads this forum and will stumble on your topic.