In addition to your addition…
I’ve learned to love AI for creating my files but I have no idea what or why it does some things the way it does. I’m still learning and I haven’t cared to dig in that deep.
I have learned to check for this kind of surprise though, especially when I use the shape builder tool. It’s easy enough to miss if you get in a hurry and the GF will always remind you with extra crispy cuts as it does exactly what you told it to do.
I’ll give you weird but it did load and was parsed correctly by the app.
The object originally presents as a single path.
The Object -> Expand command revealed a group containing a compound path.
When I released the compound path you I get the original separate paths.
The top path shown was just slightly smaller than the bottom path and had been subtracted to make the outline shown in the compound path.
I have no idea how the compound path became the single path from there.