'Ghost' line between polygons after merging

Question

Hi,

I'm working on Windows 10, ArcGIS Pro 3.2.2 in a file gdb.

After merging two polygons I get this 'ghost' line between the two previous polygons. In the illustration below I have merged only one polygon.

When I identify or select I get the whole polygon but the ghost lines are still visible:

I've run repair geometry on the feature class but that fixed nothing.

Anyone come across this before? What do those ghost lines mean and how do I get rid of them?

Thanks

Hanlie

MErikReedAugusta · Accepted Answer

The first thing I can think to troubleshoot is to hit "Edit Vertices" and see what you get.

This almost looks like it's being stored as a multi-part polygon that happens to be contiguous.

Quick fix, you can delete the offending vertices if they are there.  But the bigger issue is likely in the base dataset: Did you allow multipart polygons?  Should you have?  Is there some other reproducible bug?