Jobset - Generation fails if Text Variable used as first element of filename

Description

When text variable is first element of filename, Jobset fails to run.

Expected - Jobset completes

image.png

Steps to reproduce

  1. Set "output_filename": "Board Stats\\${DRAWING_NUMBER}_${REVISION}_Stats.txt",

  2. Run the jobset - It fails

  3. Set "output_filename": "Board Stats\\Generated_${DRAWING_NUMBER}_${REVISION}_Stats.txt",

  4. Run the jobset - It succeeds

    Good.kicad_jobset

    Bad.kicad_jobset

KiCad Version 

Application: KiCad x64 on x64

Version: 10.0.0, release build

Libraries:
	wxWidgets 3.3.2 
	FreeType 2.13.3
	HarfBuzz 12.3.0
	FontConfig 2.17.1
	libcurl/8.18.0 Schannel zlib/1.3.1

Platform: Windows 11 (build 26200), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) Graphics, 4.6.0 - Build 32.0.101.8332

Build Info:
	Date: Mar 19 2026 23:22:59
	wxWidgets: 3.3.2 (wchar_t,STL containers)
	Boost: 1.90.0
	OCC: 7.9.2
	Curl: 8.18.0
	ngspice: 45.2
	Compiler: Visual C++ 1944 without C++ ABI
	KICAD_IPC_API=ON
	KICAD_USE_PCH=OFF

Locale: 
	Lang: en_GB
	Enc: UTF-8
	Num: 1,234.5
	Encoded кΩ丈: D0BACEA9E4B888 (sys), D0BACEA9E4B888 (utf8)