Alternating panels with interior space

[mairas]

I've run into an interesting problem. (For a very small value of "interesting", that is.) I am working towards meeting JLCPCB's flex PCB panelization guidelines. My PCB is an FPC with an irregular shape. See below:

I would like to panelize it with a column-alternating pattern, connecting two J-shapes into an O-ring. KiKit is flexible enough that I've mostly managed to do it without even resorting to plugins. Here's the result:

The "interesting" part is how tabs behave. First, in the case of vertical tabs, it would seem to me that tabs are placed on ALL edge cut intersections of tab annotations, resulting in double the amount of tabs of intended. And second, interior horizontal tabs are not rendered at all. This is with tightframe framing. If I use regular frame, the interior substrate doesn't get rendered at all, and there are just long thin vertical tabs across the interior. I'm not sure what my expectation was, though.

Is this just me misusing panelization with negative hspace or an actual issue?

If I keep using tightframe but remove the inner curve tab annotations, there's no substrate inside the track. I guess that's how it should be.

I've attached my test project including the panelization script.

fpc-panel.zip

[mairas]

I don't think it's just me. I tried creating a simple 1x1 "panel" and this is what I got:

This time, also horizontal interior tabs got created, but again, the top interior curve tab get's "punched through" to the exterior bottom edge as well.

Granted, this is not a type of panel that would be useful for FR4 PCBs, but I think for flex PCBs they would still make sense.