WhoKnewKnows , 07-16-2022, 11:23 AM
I get similar behavior from Altium. Try drawing traces from one via to the next to join them all together as a means of troubleshooting, not necessarily a permanent fix. Net antenna flags usually appear on objects in a net that have no traces connecting them, or on traces that leave an object in a net and don't make a connection to another object in the net and go beyond a certain distance. In this case, for some reason Altium seems to think these vias need traces on them. It's not a single pin net, because you've got other components' pads on the same polygon/region.
On some designs, when I shelve a polygon, usually serving as a ground plane and I get it out of my way to make the design easier to work with, all of the vias that only connect to that polygon will immediately show the net antenna flag. The net antenna flags are huge and annoying, so I clear all violations from the design view VS turning off some level of checking (for fear of forgetting to enable it later). If all of the vias' net antennae are showing, and I un-shelve the polygon, usually the vias' net antennae error markers disappear. Perhaps try shelving the polygon and then unshelving? If it's not a polygon, like a region, try converting it to a polygon.
Keep in mind, net antenna checking can be enabled on-line(continuously checking as you work), or in batch mode (only checked when you run the DRC dialog). If only enabled in batch mode, something you do may correct the violation, but the error indicator may not change status until the next DRC run from the DRC dialog.
Hope this helps.