Windows 7 Slipstream update failed

Just curious, unsupported or doesn't work?
Newer DISM features don't always work when servicing images of previous versions of Windows. To learn more, see the DISM Reference.

Does that mean if I don't use fancy DISM cleanup modes, shouldn't DISM be backwards compatible?

Or is the Servicing Stack permanently broken? I remember someone trying to build a multi-edition ISO with W7 inside the W11 ISO not working, but he said W7 inside W10 ISO worked fine.
 
Usually, newer DISM / ADK have issues on downlevel Windows, but not the opposite way around

e.g. Windows 7 Host will have issues updating Windows 11 or Windows 10 > 1903 images
even Windows 8.1 can't service Windows 11 > 22H2 images properly
 
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