Can't create some builds without omitting edition name. Boot.wim always broken.

[AnubyteCode]

[09:56:35][Information] [CreatingWindowsInstaller][97%] Updating 138 files in boot.wim...
[09:56:35][Information] [CreatingWindowsInstaller][98%] Updating 138 files in boot.wim...
[09:56:35][Information] [CreatingWindowsInstaller][99%] Updating 138 files in boot.wim...
[09:56:35][Information] [CreatingWindowsInstaller][100%] Updating 138 files in boot.wim...
ManagedWimLib.WimLibException: [Open] [ERROR] Can't open "z:\tmp\x\1732895693359\MediaRoot\sources\install.esd" read-only: No such file or directory
   at ManagedWimLib.WimLibException.CheckErrorCode(ErrorCode ret)
   at ManagedWimLib.Wim.OpenWim(String wimFile, OpenFlags openFlags)
   at UnifiedUpdatePlatform.Services.Imaging.WimLibImaging.GetWIMInformation(String wimFile, WIM& wimInformationObject)
[09:56:36][   Error   ] An error occured!
[09:56:36][   Error   ] An error occurred while creating the ISO.

Host OS is IoT LTSC 2024, updated to current. Latest UUPMC build. Defender disabled.
Commands used:
.\uupmediaconverter -i z:\g.iso -u "O:\uupmc\10.0.26100.2454" -e EnterpriseG -l en-US -c LZX -t z:\tmp\x - fail
.\uupmediaconverter -i z:\g.iso -u "O:\uupmc\10.0.26100.2454" -e EnterpriseG -l en-US -c LZMS -t z:\tmp\x - fail
.\uupmediaconverter -i z:\e.iso -u "O:\uupmc\10.0.26100.2454" -e Enterprise -l en-US -c LZMS -t z:\tmp\x - ???
.\uupmediaconverter -i z:\g.iso -u "O:\uupmc\10.0.26100.2454" -l en-US -c LZX -t z:\tmp\x - partial win, no G
.\uupmediaconverter -i z:\x.iso -u "O:\uupmc\10.0.26100.2454" -e WNC -l en-US -c LZMS -t z:\tmp\x - fail

Has been happening for a long time now. Used to work, at some point doing LZMS fixed building, then using -e broke completely. Omitting edition then builds a 20-in-one using the specified language. All builds have a boot.wim that mislabels the indexes and requires manual intervention, and mislabeled core/pro indexes in install.XXX.

Former UUPMC build created Enterprise G, with the errors above, but it worked. Current does not appear to.