

Can you put an ingest test on your systems?
Throw a flag when the JSON breaks etc and track those metrics.
If they are breaking production services, they sure wouldn’t last long on any of the teams I work with.
This 100% is a management issue, both their boss, and yours.
If resources are going from one team to another, and they have separate management, that damn well better be coordinated through your boss. At the very least C.C. at the start and end of the project.
I’m all for helping out another team, that’s what you do, but sounds more like constantly cleaning up their messes.
The resource I was talking about was you, not the JSON. Pulling your time away to fix it. That has to be coordinate a level above unless both teams have the same management.
If not you may your work impacted by it, as they say, cover your ass.