Blind via missing on drill output [KiCad 10 RC1]

Description

In this file I have 1 via between In2.Cu and B.Cu:

via_bug_k10.kicad_pcb

KiCad 10 doesn't generate a drill for it, just ask to create the drill files, no "in2-back" file is generated.

Here is the original KiCad 9 file:

via_bug.kicad_pcb

Using v9 it works.

BTW: using the Python API I get the same problem and also a core dump after a few extra operations.

Steps to reproduce

  1. Load the provided PCB (i.e. pcbnew via_bug_k10.kicad_pcb)
  2. Generate the drill files (File|Fabrication ...|Drill) I used excellon defaults

KiCad Version 

Application: KiCad PCB Editor x86_64 on x86_64

Version: 10.0.0-rc1-10.0.0~rc1-3~ubuntu25.10.1, release build

Libraries:
	wxWidgets 3.2.8
	FreeType 2.13.3
	HarfBuzz 10.2.0
	FontConfig 2.15.0

Platform: Debian GNU/Linux 13 (trixie), 64 bit, Little endian, wxGTK, X11, , 
OpenGL: Mesa, llvmpipe (LLVM 19.1.7, 256 bits), 4.5 (Compatibility Profile) Mesa 25.0.7-2

	wxWidgets: 3.2.8 (wchar_t,wx containers) GTK+ 3.24
	Boost: 1.88.0
	OCC: 7.8.1
	Curl: 8.14.1
	ngspice: 44.2
	Compiler: GCC 15.2.0 with C++ ABI 1020
	KICAD_IPC_API=ON
	KICAD_USE_PCH=OFF

Locale: 
	Lang: en_US
	Enc: UTF-8
	Num: 1234.5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)